Got Nature? Blog

Posted on November 21st, 2025 in Forestry, Urban Forestry, Wildlife, Woodlands | No Comments »

The Purdue FNR extension team was named as a recipient of the Family Forests Comprehensive Education Program Award presented by the National Woodland Owners Association (NWOA) and National Association of University Forest Resources Programs (NAUFRP).

The award, which is the nation’s top honor for forestry extension programming, recognizes superior performance across nine rigorous criteria, celebrating the standard of excellence for the profession. Drs. Zhao Ma and Mike Saunders received the award on the team’s behalf at the NAUFRP annual meeting at the 2025 Society of American Foresters (SAF) national convention in Hartford, Connecticut, in October.

Ron Rathfon talks during the tree log quality course of Hardwood UniversityThe Family Forests Comprehensive Education Program Award criteria includes:

  • Faculty involved (including number and multi-disciplinary involvement)
  • Educational needs assessment (including involvement of clients)
  • Educational materials, events and other resources used
  • Applied research incorporated
  • Collaborations among disciplines, agencies and organizations
  • Results, impacts or outcomes
  • Evidence of program quality
  • Degree of innovation
  • Emulation of the program by others

NAUFRP extension chair Bill Hubbard, who oversaw the competition said “After a thorough review by our three judges and myself, the committee determined that both the University of Minnesota and Purdue University programs demonstrated such profound and differentiated excellence across the nine core criteria that it was decided to recognize them both.”

According to the NAUFRP announcement, “Purdue’s program was honored for its massive scale, its deep connection to a long-term research asset, and its commitment to building future workforce capacity.”

Program highlights include:

Teachers explore Hardwood Ecosystem Experiment research areas as part of the Natural Resources Teacher Institute.

  • HEE Integration: The program directly integrates findings from the Hardwood Ecosystem Experiment (HEE)—a 100-year research study—into its curriculum, providing landowners with unbiased, real-time data on management issues like oak/hickory regeneration and wildlife response to timber harvest.
  • Economic & Ecological Scale: The program supports the multibillion-dollar hardwood industry by having an impact on over 57,000 acres and engaging a network of tens of thousands of landowners through its extensive publications.
  • Curricular Innovation: Purdue was recognized for its pioneering move to formally incorporate Extension training into its undergraduate and graduate curricula, ensuring the next generation of forestry professionals is equipped with crucial outreach skills.

The Purdue team includes five faculty and nine professional staff members. Over the past five years, the group boasts many standout accomplishments including:

Lenny Farlee - ID That Tree opening screenshot

  • Development of publications that have been downloaded more than 2.1 million times
  • Publication and dissemination of the Indiana Woodland Steward newsletter, which has reached more than 31,000 family forest owners, impacting more than 1.2 million acres
  • Creation of 215 training programs, which reached more than 50,000 landowners, impacting more than 57,000 acres of woodlands
  • Production of 249 videos, downloaded more than 750,000 times, and 38 podcast episodes, reaching more than 50,000 listeners in the United States alone. Videos can be accessed on the FNR Extension YouTube channel. The Habitat University podcast is available as part of the Natural Resources University network.
  • Awarded more than $4.4 million in extramural funding for faculty and staff
  • Formally incorporated undergraduate and graduate students in Extension at the programmatic level

In the nomination packet, team personnel stated “We aim to address family forest owner needs through collaboration with many stakeholders. Our family forest education serves family forest owners, professional advisors, an industry that receives most of their product base from family forests and the general public who influence policy decisions affecting family forest owners. Our program focuses on adoption or maintenance of stewardship practices (e.g., invasive plant control, timber harvesting), developing or improving forestland planning, and engaging peer and professional advice. In doing these, family forest owners can make informed decisions that meet their personal land management objectives while enhancing the resource for all residents.”

Team members include:

  • Jarred Brooke – Extension wildlife specialist; Specializing in wildlife conservation, habitat management and deer impact
  • Diana Evans – Extension and web communications specialist; Specializing in website design and communications
  • Lenny Farlee – Extension forester; Specializing in forest regeneration, hardwood management and genetics
  • Dr. Rado Gazo – professor of wood processing and industrial engineering; Specializing in secondary wood products manufacturing processes
  • Dr. Eva Haviarova – professor of wood products; Specializing in strength design and product engineering of furniture and product sustainability
  • Liz Jackson – engagement specialist with the Indiana Forestry and Woodland Owners, Walnut Council and Purdue Hardwood Tree Improvement and Regeneration Center; Specializing in black walnut, oaks and landowner engagement
  • Dr. Doug Jacobs – Fred M. van Eck professor of forest biology; Specializing in forest ecology, silviculture, regeneration and restoration
  • Dr. Brian MacGowan – Extension wildlife specialist and extension coordinator; Specializing in wildlife habitat management, wildlife conservation and wildlife damage
  • Wendy Mayer – communications coordinator; Specializing in social media and communications
  • Jessica Outcalt – natural resources training specialist; Specializing in natural resources, conservation and professional development
  • Henry Quesada – professor, assistant director of Extension and ANR program leader; Specializing in wood products, hardwood lumber, biomaterials, hardwood markets and industry
  • Ron Rathfon – regional extension forester; Specializing in forest management, timber marketing, tree planting, oak regeneration and ecology and invasive vegetation management
  • Dr. Mike Saunders – professor of ecology and natural resources; Specializing in disturbance-based silviculture, growth and yield, modeling, disturbance ecology and management effects on wood quality.
  • Kat Shay – HEE forest project coordinator; Specializing in environmental science and restoration

From 2020 to 2024, the FNR Family Forest Education extension team conducted 788 programs, covering 1,005 sessions and including more than 50,000 individual contacts.

To view the original article along with other news and stories posted on the Purdue Forestry and Natural Resources website view: FNR Extension Team Receives Family Forests Comprehensive Education Award.

Resources:
Woodland Stewardship for Landowners YouTube Playlist, Purdue Extension – FNR
Wildlife Habitat Hint YouTube Playlist, Purdue Extension – FNR
Woodland Management Moment YouTube Playlist, Purdue Extension – FNR
Invasive Species YouTube Playlist, Purdue Extension – FNR
Forest Management for the Private Woodland Owner Course – Got Nature? Blog, Purdue Extension – Forestry and Natural Resources
Report Invasive Species, Purdue Invasive Species
Finding help from a professional forester, Indiana Forestry & Woodland Owners Association
Forest Improvement Handbook, The Education Store, Purdue Extension resource center
Indiana Woodland Steward Institute
Hardwood Ecosystem Experiment (HEE)
Hardwood Tree Improvement & Regeneration Center (HTIRC)
Help the Hellbender
The Nature of Teaching
Pond and Wildlife Management, website
Sustainable Communities and Community Planning, Purdue Extension
Subscribe Purdue Extension – Forestry and Natural Resources YouTube Channel

Wendy Mayer, FNR Communications Coordinator
Purdue University Department of Forestry and Natural Resources


Posted on November 8th, 2025 in Forestry, Urban Forestry, Woodlands | No Comments »

In this edition of ID That Tree, Purdue Extension Forester Lenny Farlee introduces us to Norway Spruce, a non-native conifer that has become a familiar sight across Indiana. Originally brought over from Europe, this species is now commonly planted for windbreaks, landscaping and reforestation. Learn how to recognize its distinctive shape and why it’s often chosen for both farms and front yards. Whether you’re a student, landowner or simply curious about the trees around you, this video offers a quick look at one of Indiana’s most widespread introduced evergreens.

 

If you have any questions regarding wildlife, trees, forest management, wood products, natural resource planning or other natural resource topics, feel free to contact us by using our Ask an Expert web page.

Resources:
ID That Tree – Video Playlist, Purdue Extension – Forestry and Natural Resources (FNR) YouTube Channel
Purdue Arboretum Explorer
Conservation Tree Planting: Steps to Success, Purdue Extension – FNR YouTube Channel
A Woodland Management Moment, Playlist, Purdue Extension – FNR YouTube Channel
Woodland Stewardship for Landowners, Playlist, Purdue Extension – FNR YouTube Channel
Fifty Common Trees of Indiana, Purdue Extension – FNR
Indiana Invasive Species Council
Cooperative Invasive Species Management Area (CISMA)
Report Invasive, Purdue Extension
Habitat University, Episode 12 – Exploring the challenges of Invasive Species, Habitat University-Natural Resource University
Shrubs and Woody Vines of Indiana and the Midwest, Purdue University Press
Native Trees of the Midwest, Purdue University Press
Professional Forester, Indiana Forestry Woodland Owners Association
District Forester, Indiana Department of Natural Resources, 10+ acres
Find an Arborist, International Society of Arboriculture
Forest Improvement Handbook, The Education Store

Lenny Farlee, Extension Forester
Hardwood Tree Improvement and Regeneration Center
Purdue Department of Forestry & Natural Resources


Several things come into play when it comes to determining the colors that we find on leaves of our trees. As our days get shorter and our nights get longer there is a chemical change that happens in the tree. In this video Lenny Farlee talks about the several pigments that are found in trees and what changes from summer to fall that brings us the bright colors on leaves.

Explore IndyStar Story Behind Our Fall Colors
For more on what determines the specific colors our leaves turn and how weather and other factors influence the fall display check out this recent IndyStar article: What determines what color leaves turn in the fall? The story features insights from Lenny Farlee, Purdue Extension forester, who shares his expertise on the science and beauty behind Indiana’s fall foliage.

Fall Foliage by Tree Species (click on the image to expand)

Blackgum red leaves in the fall.
Blackgum
Blackhaw tree with red leaves in the fall.
Blackhaw
Northern red oak tree with orange and yellow leaves in the fall.
Northern red oak
Sassafras tree with red leaves in the fall.
Sassafras
Shagbark hickory tree with orange leaves in the fall.
Shagbark hickory
Sugar maple tree with orange leaves in the fall.
Sugar maple (orange)
Sugr maple tree with yellow leaves in the fall.
Sugar maple (yellow)
Sweetgum tree with red leaves in the fall.
Sweetgum
White ask tree with red and yellow leaves in the fall.
White ash
White oak tree with orange leaves in the fall.
White oak
Winged sumac tree with red leaves in the fall.
Winged sumac
Birch tree with yellow leaves in the fall.
Yellow birch

Resources:
Indiana Fall Foliage Map, Explore Fall
Why Fall Color is Sometimes a Dud, Purdue Landscape Report
U.S. Forest Service Website and Hotline, Highlight Fall Colors on National Forests
ID That Tree Fall Color: Sugar Maple, Purdue Extension – Forestry and Natural Resources YouTube Channel, ID That Tree Playlist
ID That Tree Fall Color Edition: Black Gum, Purdue Extension – FNR YouTube Channel, ID That Tree Playlist
ID That Tree Fall Color Edition: Shagbark Hickory, Purdue Extension – FNR YouTube Channel, ID That Tree Playlist
ID That Tree Fall Color Edition: Virginia Creeper, Purdue Extension – FNR YouTube Channel, ID That Tree Playlist
ID That Tree Fall Color Edition: Winged Sumac, Purdue Extension – FNR YouTube Channel, ID That Tree Playlist
Autumn Highlights Tour – South Campus, Purdue Arboretum Explorer
Why Leaves Change Color – the Physiological Basis, The Education Store, Purdue Extension resource center
ID That Tree, Playlist, Subscribe to Purdue Extension – Forestry and Natural Resources YouTube Channel

Lenny Farlee, Extension Forester
Purdue University Department of Forestry and Natural Resources
Hardwood Tree Improvement & Regeneration Center (HTIRC)


As the crisp autumn air settles in and campfires become a seasonal staple, October brings an important reminder: your firewood choices matter. That’s why October is officially Firewood Month, a nationwide campaign to raise awareness about the risks of moving firewood and the spread of invasive forest pests.

Don't Move Firewood website.Why “Don’t Move Firewood” Matters
Transporting firewood, even just a few miles, can unintentionally spread destructive pests like emerald ash borer, Asian longhorned beetle and spongy moth. These invaders often hide inside or on firewood, threatening Indiana’s forests, parks and urban trees.

The Don’t Move Firewood website offers excellent resources to help you make informed choices. Whether you’re heating a cabin, heading out to hunt, or planning a backyard bonfire, they recommend:

  • Buying firewood where you’ll burn it
  • Choosing certified heat-treated wood
  • Gathering wood on-site when permitted

You can also explore their Firewood Month Toolkit, maps of regulations and a webinar series designed for professionals and outdoor enthusiasts alike.

While October is Firewood Month, the risk of spreading invasive pests lasts well beyond the fall. Many forest pests remain a threat throughout the year. Adults may still be visible until the first hard freeze, and egg masses can be observed from now through June. The spotted lanternfly females lay egg masses in late summer through early winter, often peaking in October. These masses can survive through winter and hatch in the spring. Learn more about the Spotted Lanternfly from the Indiana Department of Natural Resources. This is why it’s important to practice safe firewood habits year-round.

Spotlight on ReportINvasive
Check out the latest post on the ReportINvasive Facebook which reinforces the importance of Firewood Month. ReportINvasive is a trusted source for updates on invasive species in Indiana, and their social media outreach is a great way to stay informed and engaged. Give the Facebook page a LIKE and FOLLOW for future webinars and workshops.

Concerned About Insects? Purdue Extension Entomology Can Help
ReportINvasive Facebook post, October Firewood Month.If you suspect insect damage or want to learn more about forest pests, the Purdue Extension Entomology team is an outstanding resource. Their experts provide science-based guidance on insect identification, management strategies, and outreach materials to help protect Indiana’s ecosystems.

Let’s work together to keep Indiana’s forests healthy and resilient. This October, make the smart choice—don’t move firewood!

More Resources
Spotted Lanternfly – including map sharing locations, Indiana Department of Natural Resources
October is Firewood Awareness Month!, Purdue Landscape Report
Indiana Department of Natural Resources: Invasive Species
Indiana Invasive Species Council
Cooperative Invasive Species Management Area (CISMA)
Aquatic Invasive Species, Illinois-Indiana Sea Grant (IISG)
Emerald Ash Borer Information Network, Purdue University and Partners
Invasive plants: impact on environment and people, The Education Store, Purdue Extension’s resource center
Entomology Weekly Review, Indiana Department of Natural Resources, Division of Entomology & Plant Pathology
Division of Entomology & Plant Pathology, Indiana Department of Natural Resources

Diana Evans, Extension and Web Communication Specialist
Purdue University Department of Forestry and Natural Resources


Welcome to ID That Tree! In this episode, Purdue Extension Forester Lenny Farlee introduces us to multiflora, a non-native invasive shrub that has become widespread across Indiana. Once planted for practical purposes, it now creates big challenges for landowners and natural areas. Learn where you’re most likely to encounter it, why it spreads so aggressively and what makes it stand out on the landscape. Whether you’re a student, nature enthusiast or land manager, this video gives you a quick introduction to one of Indiana’s most troublesome invasive plants.

 

If you have any questions regarding wildlife, trees, forest management, wood products, natural resource planning or other natural resource topics, feel free to contact us by using our Ask an Expert web page.

Resources:
ID That Tree – Video Playlist, Purdue Extension – Forestry and Natural Resources (FNR) YouTube Channel
Purdue Arboretum Explorer
Conservation Tree Planting: Steps to Success, Purdue Extension – FNR YouTube Channel
A Woodland Management Moment, Playlist, Purdue Extension – FNR YouTube Channel
Woodland Stewardship for Landowners, Playlist, Purdue Extension – FNR YouTube Channel
Fifty Common Trees of Indiana, Purdue Extension – FNR
Indiana Invasive Species Council
Cooperative Invasive Species Management Area (CISMA)
Report Invasive, Purdue Extension
Habitat University, Episode 12 – Exploring the challenges of Invasive Species, Habitat University-Natural Resource University
Shrubs and Woody Vines of Indiana and the Midwest, Purdue University Press
Native Trees of the Midwest, Purdue University Press
Professional Forester, Indiana Forestry Woodland Owners Association
District Forester, Indiana Department of Natural Resources, 10+ acres
Find an Arborist, International Society of Arboriculture
Forest Improvement Handbook, The Education Store

Lenny Farlee, Extension Forester
Hardwood Tree Improvement and Regeneration Center
Purdue Department of Forestry & Natural Resources


Posted on October 9th, 2025 in Disease, Forestry, Urban Forestry, Woodlands | No Comments »

Purdue Landscape Report: By now, the emerald ash borer (EAB) invasion is an old story for landscapes and forests in the Midwest. Since EAB was first found in North America in 2002 more millions of ash trees than we can know have died and this tiny insect continues to kill ash in an ever widening zone that currently includes 37 US states and 6 Canadian provinces. Arborists and landscape managers continue to protect valuable ash trees by use of systemic insecticides, typically applied via trunk injection every 2-3 years.

While EAB is the overarching threat, ash survival may also be threatened by wood decay fungi, which may colonize insect exit holes, injections sites and other wounds. The most common decay fungi we see in the lab are Perenniporia and Fomitopsis.

Perenniporia fraxinophila is the most frequently reported wood decay fungus on ash and causes a heart rot that contributes to loss of structural integrity of the tree. Infection sites tend to be high on the tree and may be easily overlooked until decay is advanced. The fungal structure is perennial, expanding each year, and may be confused with Ganoderma applanatum, the artist’s conk. The upper surface turns black or brown with age and the underside is white with pores instead of gills.


Figure 1: Upper ash branches colonized by a suspected Perenniporia sp. (PLR)
Figure 1: Upper ash branches colonized by a suspected Perenniporia sp. (PLR)

Figure 2: Fungal conks of a suspected Perenniporia sp., beginning to emerge from decaying ash branches. (PLR)
Figure 2: Fungal conks of a suspected Perenniporia sp., beginning to emerge from decaying ash branches. (PLR)

Figure 3: Fungal conks of a suspected Perenniporia sp., beginning to emerge from decaying ash branches. (PLR)
Figure 3: Fungal conks of a suspected Perenniporia sp., beginning to emerge from decaying ash branches. (PLR)

 

In the last few years, we have had a few samples of a similar fungus colonizing the trunk and base of ash trees, often near injection sites. Initially we were unable to identify the fungus, but DNA analysis revealed the fungus was a Fomitopsis species. This fungus develops a shallow shelf structure with white top and tan underside.

Fungal decay presents a greater risk to ash because it lacks the preservative enriched heartwood found in oak, walnut and other hardwoods that tends to slow down internal spread of fungi. Even fungi that initially invade dead areas of ash may rapidly colonize and degrade stem and trunk tissue.


Figure 4: Fomitopsis sp. colonizing the trunk of ash trees damaged by EAB. (PLR)
Figure 4: Fomitopsis sp. colonizing the trunk of ash trees damaged by EAB. (PLR)

Figure 5: Fomitopsis sp. colonizing the trunk of ash trees damaged by EAB. (PLR)
Figure 5: Fomitopsis sp. colonizing the trunk of ash trees damaged by EAB. (PLR)

Figure 6: Fomitopsis sp. colonizing the trunk of ash trees damaged by EAB. (PLR)
Figure 6: Fomitopsis sp. colonizing the trunk of ash trees damaged by EAB. (PLR)

 

Fungal decay also disrupts vascular tissues in the stems and trunk, which further limits the movement and effectiveness of insecticide injections, so that infected trees may face greater damage from EAB. When found on small side branches the infection might be successfully pruned out, but in most cases the decay is in major branches or the trunk, which means the tree will need to be removed. If your ash trees that are being regularly treated for EAB but continue to show thinning and decline, check for these fungal invaders, they may be partly responsible.

View the original article on the Purdue Landscape Report website: Fungal Decay of Ash Trees.

Subscribe and receive the newsletter: Purdue Landscape Report Newsletter.

Resources:
Diplodia Tip Blight of Two-Needle Pines, The Education Store, Purdue Extension resource center
Boxwood Blight, The Education Store
Disease of Landscape Plants: Cedar Apple and Related Rusts on Landscape Plants, The Education Store
Planting Your Tree Part 1: Choosing Your Tree, Purdue Extension – Forestry & Natural Resources (FNR) YouTube Channel
Tree Planting Part 2: Planting a Tree, Purdue Extension – FNR YouTube Channel
Find a Certified Arborist, Trees are Good-International Society of Arboriculture (ISA)
Video: Step by Step to Find an Arborist, Trees are Good-International Society of Arboriculture (ISA)
Professional Forester, Indiana Forestry Woodland Owners Association
District Forester, Indiana Department of Natural Resources, 10+ acres
Trees and Storms – The Education Store
Why Is My Tree Dying? – The Education Store
Tree Risk Management – The Education Store
Tree Pruning Essentials, Publication & Video, The Education Store
Tree Wound and Healing, Got Nature? Blog, Purdue Extension – FNR
What are Invasives Species and Why Should I Care?, Got Nature? Blog, Purdue Extension – FNR
Subscribe – Purdue Extension-FNR YouTube Channel

Tom Creswell, Plant & Pest Diagnostic Laboratory Director
Purdue Botany and Plant Pathology


Purdue Landscape Report: It’s finally October, and we should be enjoying lovely fall temps and colors. While some of the trees are changing, it’s not necessarily due to the change in seasons. As I write this, the temperature is 84 F (29 C). I look out my window and see mostly green leaves with some colors from the short cold snap we had and some from heat and drought stress. Whether you are worried about the trees in your yard and community or not, there are some simple tasks that we can do to assist them as we await the cooler temperatures of Autumn.

A 3 foot radius mulch ring around a medium sized tree

A 3 foot radius mulch ring around a medium sized tree (Purdue Landscape Report)

Mulching: One simple task to better prepare your trees for winter is to add a new layer of mulch, which benefits your trees in multiple ways. Adding a 2-3 inch thick layer of mulch will better maintain moisture levels and buffer extreme temperature changes in the soil and will add some organic matter too. Mulching to the drip line will benefit the tree the most, but in the case of larger trees it’s not always feasible. Try for at least a 3-foot radius from the trunk and make sure to leave a 2 inch or so gap between the trunk and the mulch. Remember, no volcano mulching.

Fertilizing: That mulch you just added will add some organic material to your soil as it slowly breaks down, but an autumn fertilization can benefit your trees too. Unlike trees in the forest that have a natural supply of nutrients from fallen leaves and twigs, trees around our homes are usually deprived as we rake and clean up our yards. Adding a slow-release fertilizer in the fall helps provide a nutrient boost over the winter, can promote root growth, and better prepare your tree for Spring.

Watering: Water is still an essential part of your tree care plan, but as temperatures drop and trees begin to head into dormancy they don’t need as much water as is required in the hit summer months. If you have irrigation systems in your yard start to drop the frequency of watering. You can water up until the first freeze, but make sure soils are just a little damp and not soaked. Evergreens in particular will benefit from slow deep watering 1-2 times a week until the soil freezes. Winter winds and temperatures can desiccate the needles without an adequate supply of water.

Pruning: Now is a good time to prune out any dead, damaged, or diseased limbs in your trees. If you have access to hand saws and pole saws or pruners, you can remove smaller branches or those closer to the ground. Make sure you are making proper pruning cuts though, and if there are large limbs, those at heights, or you are just unsure of how to make a good cut enlist the help of a professional arborist.

Use of white tree guards can protect the trunk from temperature changes that cause damage

Use of white tree guards can protect the trunk from temperature changes that cause damage (Joseph O’Brien, USDA Forest Service)

Trunk Damage: Sunscald or southwest damage occurs on young and/or thin barked trees in the winter. Wounds can occur between the south to southwest facing part of the trunk on sunny days in the winter as temperatures rise and suddenly drop. Over time these wounds can become quite large. Trees can also incur damage from deer during the rut. Bucks will scrape trees with their antlers, scraping off the bark and damaging the cambium. Both of these injuries can be reduced one younger trees by installing tree guards in the fall. Tree guards are plastic barriers you place around the main stem of the tree. I recommend using white corrugated drainage pipe that can be found at most home centers. You can make a cut lengthwise along the pipe for easy installation and make sure it has a large enough diameter to leave a space between it and the tree. Just remember to remove it come Spring.

Inspections: Visual inspections can be done year-round, but this time of the year it might be easier to see changes in your tree as leaves are falling and the canopy becomes more visible. From the ground up to the canopy, some of the things you’re looking for include fungal growth around the base of the tree, any sort of damage on the main stem or branches, premature leaf drop or color change, and branches that are dead, cracked, diseased, or seem weak. Any concerns you find are also great information to share with an ISA Certified arborist which can be found using the Trees Are Good website.

View the original article on the Purdue Landscape Report website: Help Your Trees Transition into Autumn.

Subscribe and receive the newsletter: Purdue Landscape Report Newsletter.

Resources:
Re-mulch Your Trees, Purdue Landscape Report
Find an Arborist video, Trees are Good-International Society of Arboriculture (ISA)
Trees and Storms – The Education Store, Purdue Education’s resource center
Moist soil and rotten roots makes it easy for trees to come crashing down – Fox 59 News
Expert: Some storm damage can be easily prevented – Fox 59
Why Is My Tree Dying? – The Education Store
Tree Risk Management – The Education Store
Tree Pruning Essentials, Publication & Video, The Education Store
Mechanical Damage to Trees: Mowing and Maintenance Equipment – The Education Store
Trees and Electric Lines – The Education Store
Tree Defect Identification, The Education Store
Planting Your Tree, video, Purdue Extension
Tree Installation, The Education Store
Tree Wound and Healing, Got Nature? Blog, Purdue Extension – Forestry and Natural Resources
Subscribe – Purdue Extension-FNR YouTube Channel

Ben McCallister, Urban Forestry Specialist
Purdue Forestry & Natural Resources


Purdue Landscape Report: Aspen, cottonwood, and poplar are all names for the fast-growing Populus tree species. Used widely for building materials, these trees are often located around ponds, riverbanks, and sloping areas toward water bodies (especially cottonwood). Cottonwood flowers produce little white tufted seeds that float through the air which a lot of people love (my kids included), unless it lands in their mouth. These beautiful trees are susceptible to a fungus that can cause significant damage under the right conditions: Marssonina (newer name is Drepanopeziza).

There are three species of Marssonina that can infect Populus – different tree species may only be susceptible to one of the Marssonina species. The fungi cause the same kind of disease and develop similarly on the host. Marssonina can infect the leaves, stems and seeds of Populus, which can lead to large amounts of leaf loss during wet weather, girdled stems and dieback, and aborted seeds. Since seeds can carry the fungus, the seed will take it with it to where it lands and can become infected immediately after germinating. It is common to see high disease severity in the canopy, but unless there is significant leaf loss (up to 70% defoliation) it may not reduce plant vigor. Leaf lesions typically develop as small black to brown dots or flecks which expand in size as time goes one. As the disease progresses, large areas of the leaf will become necrotic, creating odd dead blotches, potentially killing the majority of the leaf blade.

The fungus produces asexual spores in a small black pustule on the upper surface of the leaf which will eventually burst and release the spores during humid weather early in the spring. Marssonina will continue to produce spores and cause disease the whole season, creating repeat infections on the same tree. Symptoms tend to start lower in the canopy and ascend up the tree as the season progresses. The spores are spread by water splash, so rainfall will help spread this fungus in the landscape.

For trees planted in native landscapes, this disease will likely be inevitable and may make the foliage look less than stellar. That being said, removing leaves that drop or at the end of fall will reduce total inoculum for future seasons and can reduce total disease long-term. Similarly, trees that are stressed will typically develop increased disease severity, so if you are seeing large amounts of leaf spots or leaf loss, I would recommend employing stress mitigation strategies to keep the tree happy and healthy (fertilizer, mulch, irrigation as needed, etc.). If a tree appears to develop significant disease every year and has reduced limb growth, you may consider removing the tree if you are concerned it may die early and replace with a resistant clone, as disease susceptibility can vary greatly between clones of the same species.

Fig 1: Populus sp. with significant leaf loss due to Marssonina leaf spot. Photo credit: PPDL
Fig 1: Populus sp. with significant leaf loss due to Marssonina leaf spot. Photo credit: PPDL
Fig 2: Aspen wit thinning tree canopy due to Marssonina infection. Photo credit: PLR
Fig 2: Aspen wit thinning tree canopy due to Marssonina infection. Photo credit: PLR
Fig 3: Necrotic flecks and dots associated with early infection by Marssonina. Photo credit: PPDL
Fig 3: Necrotic flecks and dots associated with early infection by Marssonina. Photo credit: PPDL
Fig 4: Leaf necrosis and twig dieback caused by Marssonina. Photo credit: PLR
Fig 4: Leaf necrosis and twig dieback caused by Marssonina. Photo credit: PLR
Fig 5: Severely leaf necrosis of an aspen tree caused by repeat infections by Marssonina. Photo credit: PPDL
Fig 5: Severely leaf necrosis of an aspen tree caused by repeat infections by Marssonina. Photo credit: PPDL

View the original article on the Purdue Landscape Report website: Marssonina leaf spot and blotch of Poplar.

Subscribe and receive the newsletter: Purdue Landscape Report Newsletter.

Resources:
ID That Tree, Playlist, Purdue Extension – FNR YouTube Channel (Invasive White Mulberry, Siberian Elm, Tree of Heaven)
Eastern Cottonwood, Article, Purdue Fort Wayne
Find a Certified Arborist, Trees are Good-International Society of Arboriculture (ISA)
Video: Step by Step to Find an Arborist, Trees are Good-International Society of Arboriculture (ISA)
Professional Forester, Indiana Forestry Woodland Owners Association
District Forester, Indiana Department of Natural Resources, 10+ acres
Trees and Storms – The Education Store, Purdue Education’s resource center
Why Is My Tree Dying? – The Education Store
Tree Risk Management – The Education Store
Tree Pruning Essentials, Publication & Video, The Education Store
Tree Defect Identification, The Education Store
Planting Your Tree, video, Purdue Extension
Tree Installation, The Education Store
A Woodland Management Moment, Playlist, Purdue Extension – FNR YouTube Channel (Against Invasives, Garlic Mustard, Autumn Olive)
Woodland Stewardship for Landowners, Playlist, Purdue Extension – FNR YouTube Channel (Common Buckthorn, Japanese Barberry)
Indiana Invasive Species Council
Indiana Department of Natural Resources: Invasive Species
Subscribe – Purdue Extension-FNR YouTube Channel

John Bonkowski, Lead Extension Administrator
Purdue Department of Botany and Plant Pathology

 


Posted on September 25th, 2025 in Safety, Urban Forestry, Woodlands | No Comments »

Screenshot of Harvest Head: Combine & Field Fires on IN-PREPared website.IN-PREPared: As harvest 2025 continues across Indiana, unusually dry conditions have increased the risk of combine and field fires. Farmers and landowners are urged to take extra precautions: perform regular equipment maintenance, clean combines frequently to remove crop residue and keep fully charged fire extinguishers accessible at all times.

This season brings plenty of opportunities to enjoy campfires, cookouts and hayrides – but please enjoy these activities safely. Be mindful of fire safety, especially in dry areas, and always check for local burn bans before lighting any recreational fires.

Combine fires are a much too common sight throughout Indiana and the Midwestern corn belt during the fall harvest season. Sometimes these equipment fires spread to the surrounding fields and cause property damage and threaten or even take lives. Dry weather makes harvest-related fires even more likely. This site offers ready-to-use materials to help Extension staff, media outlets, emergency managers and agricultural organizations raise awareness about preventing combine and field fires — and responding safely if one occurs.

Click on the website to view more resources and information: Combine & Field Fires.

Resources:
FNR Ask The Expert: Prescribed Fire, Purdue Extension Forestry & Natural Resources
Wildlife Habitat Hints: Prescribed Fire Techniques, view – Point Source Fire, Ring Fire, Flanking Fire, Strip Head Fires, Backing Fire and Late Growing Season Prescribed Fire, Purdue Extension Forestry & Natural Resources YouTube Channel
October Is Firewood Month: Protect Indiana’s Forests by Making Smart Choices, Purdue Extension – FNR Got Nature? Blog
100 Year Project Shares New Video, Prescribed Fire, Purdue Extension – FNR Got Nature? Blog
Brooke’s Prescribed Fire Videos Utilized in Global USFS Efforts, Purdue Extension – FNR Got Nature? Blog
Renovating Native Warm-Season Grass Stands for Wildlife: A Land Manager’s Guide, The Education Store, Purdue Extension resource center
Prescribed fire: 6 things to consider before you ignite, Got Nature? Blog, Purdue Extension – 4Forestry and Natural Resources
An Introduction to Trees of Indiana, Purdue University Press
Native Trees of the Midwest, Purdue University Press
ID That Tree, Playlist, Subscribe to Purdue Extension – Forestry and Natural Resources YouTube Channel
A Woodland Management Moment, Playlist, Purdue Extension – FNR YouTube Channel
Forest Improvement Handbook, The Education Store
Finding help from a professional forester, Indiana Forestry & Woodland Owners Association
District Foresters for 10 plus acres, Indiana Department of Natural Resources

Ed Sheldon, Farm/Veteran Job Coach and Engagement Coordinator
Department of Agriculture & Biological Engineering, Purdue University


Posted on August 12th, 2025 in Forestry, How To, Urban Forestry, Wildlife | No Comments »

Welcome to ID That Tree! In this episode, Purdue Extension Forester Lenny Farlee introduces us to a widespread and often overlooked native plant, the wild grape vine. Found across Indiana, this vine is especially noticeable in late summer and fall. Learn how to identify wild grape by its vine structure, bark, leaves and growth. Whether you’re a nature enthusiast, land manager or just curious about native plants, this video offers a quick and informative look at how to spot wild grape vine and appreciate its role in Indiana’s ecosystems.

 

If you have any questions regarding wildlife, trees, forest management, wood products, natural resource planning or other natural resource topics, feel free to contact us by using our Ask an Expert web page.

Resources:
ID That Tree – Video Playlist, Purdue Extension – Forestry and Natural Resources (FNR) YouTube Channel
Purdue Arboretum Explorer
Conservation Tree Planting: Steps to Success, Purdue Extension – FNR YouTube Channel
A Woodland Management Moment, Playlist, Purdue Extension – FNR YouTube Channel
Woodland Stewardship for Landowners, Playlist, Purdue Extension – FNR YouTube Channel
Indiana Department of Natural Resources: Invasive Species
Indiana Invasive Species Council
Cooperative Invasive Species Management Area (CISMA)
Report Invasive, Purdue Extension
Fifty Common Trees of Indiana, Purdue Extension – FNR
Habitat University, Episode 12 – Exploring the challenges of Invasive Species, Habitat University-Natural Resource University
Shrubs and Woody Vines of Indiana and the Midwest, Purdue University Press
Native Trees of the Midwest, Purdue University Press
Professional Forester, Indiana Forestry Woodland Owners Association
District Forester, Indiana Department of Natural Resources, 10+ acres
Find an Arborist, International Society of Arboriculture
Forest Improvement Handbook, The Education Store

Lenny Farlee, Extension Forester
Hardwood Tree Improvement and Regeneration Center
Purdue Department of Forestry & Natural Resources


Got Nature?

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