Got Nature? Blog

Purdue Landscape Report: Inonotus dryadeus is one of the more common wood decay fungi we receive at the diagnostic lab in association with declining trees, specifically oaks. Inonotus is found so frequently on oaks it has the common name oak bracket fungus, but it can cause root rot of a number of other hardwood trees (including maples, sweet gum, buckeyes, chestnut, and ash) and conifers (fir, pines, spruce, and hemlock – mostly in western US).

Similar to other butt and root rots of trees, Inonotus causes internal decay near the base of the tree. Trees may not show any external symptoms while there is a raging root rot decaying everything holding it up, eventually leading to an unexpected failure of the tree during a windstorm. Trees with compromised root systems may also die suddenly during hot and dry weather. Most often, we see a gradual decline of infected trees with stunted growth, limb dieback, and/or sparse, off-color foliage; symptoms that may accelerate during adverse environmental conditions (Figure 1).

The only good thing about this fungus is that it is somewhat easy to identify. Inonotus produces a round to irregularly-shaped conk like structure each year from colonized host tissue, such as exposed roots, the trunk at the soil-line, or lower trunk (Figure 2). When it is young the conk is yellow to orange on the upper surface and white on the underside. Pores in the upper surface of the conk producing amber colored liquid can also be found earlier in the spring and early summer, lending to its other common name the weeping conk (Figure 3).

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The Indiana Natural Resources Conservation Service (NRCS) is offering an opportunity for landowners to apply for cost assistance with conservation practices like tree planting, forest stand improvement, invasive species control, wildlife habitat improvement and many others.

U.S. Department of Agriculture, Natural Resources Conservation Service News Release, Indianapolis, IN, October 11, 2023 – Farm Bill program application dates have been set for Indiana’s agricultural producers who want to improve natural resources and address concerns on their land. Curtis Knueven, USDA-Natural Resources Conservation Service (NRCS) Acting State Conservationist, announced that December 8 will be the application deadline for the Environmental Quality Incentives Program (EQIP) and Conservation Stewardship Program (CSP) in Indiana. This year’s funding levels are a historic high for Indiana NRCS, bringing $42 million in EQIP and $22 million in CSP for Indiana landowners.

EQIP is a voluntary conservation program available for agricultural producers. Through EQIP, NRCS provides financial and technical assistance to install conservation practices that reduce soil erosion and sedimentation, improve soil health, improve water and air quality and create wildlife habitat. Also included in this sign up are several state and national initiatives. A full list of initiatives can be found by visiting www.nrcs.usda.gov/programs-initiatives/eqip-environmental-quality-incentives/indiana/environmental-quality-incentives.

“EQIP helps agricultural producers in a manner that promotes agricultural production and environmental quality as compatible goals,” said Knueven. “Farmers can receive assistance to implement structural and management conservation practices that optimize environmental benefits on their working agricultural land while helping to increase their yields.”

CSP is an important Farm Bill conservation program that helps producers who are already practicing good stewardship to take their natural resource management to the next level. The program helps to improve both their agricultural production and provide valuable conservation benefits such as cleaner and more abundant water, as well as healthier soils and better wildlife habitat.

“Whether you are looking to improve grazing conditions, increase crop resiliency, or develop wildlife habitat, we can custom design a CSP plan to help you meet those goals,” Knueven said. “We can help you identify natural resource problems in your operation and provide technical and financial assistance to solve those problems or attain higher stewardship levels in an environmentally beneficial and cost-effective manner.”

While applications are accepted year-round, interested producers should work with their local NRCS staff and apply by December 8 to be considered for the current funding period. Applications received after December 8 will automatically be considered during the next funding cycle.

For more information about Farm Bill programs and other technical and financial assistance available through Indiana NRCS conservation programs, visit www.nrcs.usda.gov/indiana or contact your district conservationist www.farmers.gov/working-with-us/service-center-locator.

Resources:
Woodland Stewardship for Landowners: EQUP, video, Purdue Extension-Forestry and Natural Resources (FNR) YouTube Channel
Woodland Stewardship for Landowners: Single Tree and Patch-Cut Harvesting, Purdue Extension – FNR Video
Woodland Stewardship for Landowners YouTube Playlist, Purdue Extension – FNR
Woodland Management Moment: Invasive Species Control Process, Purdue Extension – FNR Video
Woodland Management Moment YouTube Playlist, Purdue Extension – FNR
Invasive Species YouTube Playlist, Purdue Extension – FNR
What are invasive species and why should I care?, Got Nature? Blog, Purdue Extension – Forestry and Natural Resources
Report Invasive Species, Purdue Invasive Species
The GLEDN Phone App – Great Lakes Early Detection Network
EDDMaps – Early Detection and Distribution Mapping System
Hardwood Ecosystem Experiment: Uneven-aged Management, Purdue Extension – FNR Video
Hardwood Ecosystem Experiment: Even-aged Management, Purdue Extension – FNR Video
Finding help from a professional forester, Indiana Forestry & Woodland Owners Association
Forest Improvement Handbook, The Education Store, Purdue Extension resource center

Natural Resources Conservation Service
U.S. Department of Agriculture

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

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Purdue Landscape Report: Mites are eight-legged arthropods who pierce plant cells to feed on them.  Plants that are attacked by mites lose their green color and appear somewhat bronzed. Spider mites will make webs to help them forage on leaves unencumbered by irregular leaf surfaces. The accumulation of webs, and old skins of mites can give heavily infested plants a dusty appearance. This can make plants unsightly and affect their health.

Lack of rain this summer and fall has spared spider mites from drowning and being washed off leaves during heavy rains.   Warm weather in late August and September allowed warm season mites, like two spotted spider mite, European red mite on flowering fruit trees, honeylocust, maple and oak spider mites to flourish. With the daily highs consistently below 85 F, cool season mites like spruce spider mite, boxwood spider mite and southern read mite have been increasing in number.

Now would be a good time to take stock of which plants have spider mites to help you plan your control strategy.

Cool season mites, including southern red mite, boxwood spider mite and spruce spider mite may require treatment this fall to keep their populations from building. This could be accomplished with a garden hose and a strong stream of water or a 2% solution of horticultural oil or insecticidal soap.

At this point in the season, there is usually no need to spray trees for warm season spider mites.  Because most spider mites will winter on trees and shrubs, these mite infested trees can be targeted for a spray of oil during the dormant season.  It is important to note that plants with two spotted spider mites will not benefit from an oil spray because they winter in the ground cover. Also, be sure not to spray oil on shrubs with waxy blue leaves. This wax often protects plant leaves from strong winds and sun in the winter.

To view this full article and other Purdue Landscape Report articles, please visit Purdue Landscape Report.

Subscribe and receive the newsletter: Purdue Landscape Report Newsletter.

Resources:
Managing Spider Mite Mayhem with the Purdue Plant Doctor, Purdue Extension Entomology YouTube Channel
Purdue Plant Doctor Website
Spider Mites On Ornamentals, Purdue Extension Entomology Bulletin
Tree Defect Identification, The Education Store
Tree wounds and healing, Got Nature? Blog
Tree Risk Management – Got Nature? Blog, Purdue Extension – FNR
Why Is My Tree Dying? – Got Nature? Blog, Purdue Extension – Forestry and Natural Resources
The Woody Plant Seed Manual, U.S. Forest Service
Native Trees of the Midwest, The Education Store
Invasive Species, Playlist, Purdue Extension – FNR YouTube Channel
Report Invasive Species, Purdue Invasive Species
Find an Arborist, International Society of Arboriculture
Subscribe Purdue Extension-Forestry and Natural Resources YouTube Channel

Cliff Sadof, Professor and Extension Fellow
Purdue Entomology

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Purdue Landscape Report: Dead man’s fingers is an apt moniker for a gruesome-looking fungus (Xylaria polymorpha and related species) that produces club-shaped fungal fruiting bodies that appear as fingers growing around the base of dying or dead woody plants and even wooden objects in soil (Fig. 1).  With more than 25 species of Xylaria, generalizations are difficult to make (Fig. 2), but we will persevere anyways, recognizing that some Xylaria species are limited to a saprophytic existence decomposing wood (like X. polymorpha) while others, like X. mali, cause an opportunistic black root rot on apple and crabapple (Rogers, 1984; Rogers and Callen, 1986) or nothing at all (Fig. 2). Other Xylaria species infect Norway maple, honey-locust, elm and pears (flowering and edible).  Perhaps the scariest thing about dead man’s fingers is its taxonomy: X. polymorpha is an extremely variable and complicated species showing “multiple interfaces and intergradations with numerous other taxa” making speciation a challenge (Lee et al, 2000), which may explain why a crabapple with a bad graft union covered in dead man’s fingers looks otherwise healthy!

Symptoms and Signs

Symptoms of infection by Xylaria may appear as stress and decline, including slowed growth, dieback, premature autumn coloration and leaf drop, and even crown or structural root cankers. Apple, crabapple or pear trees infected may produce an unusually large crop of undersized fruit.

Signs of Xylaria are more readily identified—namely, the dead man’s fingers (Fig. 4)! The club shaped, fingerlike fruiting bodies appear singularly or as clustered “fingers” about  1- 4 inches high, often at the base of infected or dying trees, or nearby large structural roots (Fig 4).  In the spring, ascospores are produced by the “fingers”, creating a bluish bloom on the tips of the fingers. Cutting into a finger reveals a white interior with black bubbles that produce the sexual spores (ascospores).  The “fingers” can release these spores for several months or years.  In the spring, Xylaria can produce asexual spores (called conidia) anywhere on its surface, while also producing threadlike structures (called hyphae) that grow through dead or dying wood.  Xylaria can survive as hyphae in roots for up to 10 years and can spread from plant to plant via hyphae when plant roots contact each other.

To view this full article and other Purdue Landscape Report articles, please visit Purdue Landscape Report

Subscribe and receive the newsletter: Purdue Landscape Report Newsletter.

Resources:
Tree Defect Identification, The Education Store
Tree wounds and healing, Got Nature? Blog
Tree Risk Management – Got Nature? Blog, Purdue Extension – FNR
Why Is My Tree Dying? – Got Nature? Blog, Purdue Extension – Forestry and Natural Resources
The Woody Plant Seed Manual, U.S. Forest Service
Native Trees of the Midwest, The Education Store
Invasive Species, Playlist, Purdue Extension – FNR YouTube Channel
Report Invasive Species, Purdue Invasive Species
Find an Arborist, International Society of Arboriculture
Subscribe Purdue Extension-Forestry and Natural Resources YouTube Channel

Janna Beckerman, Professor of Plant Pathology
Purdue Department of Botany

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Purdue Extension Showcase, Purdue Extension Annual Report highlights Purdue Extension-Forestry and Natural Resources Hardwood University program: Indiana ranks fourth in the U.S. in hardwood industry production. According to Indiana’s Department of Natural Resources, the hardwood industry contributes $17 billion in value-added to the Indiana economy. However, lack of skilled hardwood employees is the No. 1 impediment to industry success and growth. The number of job openings in wood products manufacturing exceeds the number of qualified applicants by a factor of 3:1 to 10:1. Hardwood industries employees require specialized training to produce lumber and hardwood products, and to maintain sustainable productivity of forest resources.

Purdue Extension annually offers a program, Hardwood University, to provide expertise, technical assistance, and education to industrial stakeholders engaged in wood products manufacturing to solve issues related to raw material quality, processing technologies, and manufacturing efficiency. Participants are business owners, chief executive and operations officers, production managers, supervisors, engineers, designers, equipment operators and industry associations in both primary hardwood products manufacturing for lumber and veneer, and secondary wood products manufacturing of furniture, cabinets, millwork, flooring and others. Nine monthly sessions during the academic year provide over 50 hours of instruction. Each session is a minimum of six hours and held at forestry or manufacturing worksites across Indiana. Hardwood industry professionals learned about sustainability of material supply, best management practices, procurement and marketing, tree, log and lumber quality and measurement, step-by-step processing techniques, equipment, and decision-making.

Participants may choose to focus on one of three tracks: 1) primary industry for log buyers, sawmill, stave mill, veneer mill, and lumber drying operators, 2) secondary industry for furniture, cabinet, millwork and other manufacturers of wood products, and 3) training a la carte for companies and individuals that would like to organize in-house training on a selected topic. Participants who finish all nine sessions in a chosen track within two years receive a program completion recognition from external partner Indiana Hardwood Lumbermen’s Association. In addition, sessions qualify for continuing education credits for certified foresters (Society of American Foresters), and consulting foresters (Association of Consulting Foresters). In one year of the program, 168 employees attended the sessions. Participants were employees new to the hardwood industry and employees preparing for advancement or cross-training.

On post-surveys, participants indicated they learned something new, increased awareness, and learned new skills. Participants indicated practices from the sessions that they plan to implement in the next 12 months. Most comments addressed lumber drying, including adjust kiln drying schedule, build/buy lumber dry kiln, change kiln startup procedure, change yard locations for drying particular species, eliminate standing water in yard, improve air flow in yard, and establish lumber drying operation. Also mentioned were: setting up lumber grading for company and training employees to grade lumber, conducting saw maintenance and changing sawing procedures, focusing on management – getting more education, implementing plan, or pursuing professional assistance, and identifying and sorting lumber by quality. Purdue Extension’s training for employees working in the hardwoods industry helps produce skilled workers for company success and to ensure sustainable management of woodlands across Indiana.

To read full article and others, check out Purdue Extension Showcase 2023.

Resources:
Hardwood Tree Improvement & Regeneration Center (HTIRC)
Tropical HTIRC
An Introduction to Trees of Indiana, The Education Store, Purdue Extension resource center
Native Trees of the Midwest, The Education Store
Shrubs and Woody Vines of Indiana and the Midwest, The Education Store
ID That Tree, Playlist, Subscribe to Purdue Extension – Forestry and Natural Resources YouTube Channel
A Woodland Management Moment, Playlist, Purdue Extension – FNR YouTube Channel
Investing in Indiana Woodlands, The Education Store
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
Sustainable Biomaterials, FNR Concentration
Wood is Best Video, Woodisbest.org

Rado Gazo, Professor of Wood Processing and Industrial Engineering
Purdue University Department of Forestry and Natural Resources

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Hunters have been busy preparing food plots, hanging tree stands and working on their marksmanship skills in hopes for getting that buck of a lifetime.  The Indiana deer hunting season for 2023-2024 started September 15th and goes to January 31st.  As your hunting adventures begin, Purdue Extension-Forestry and Natural Resources (FNR) has the resources you need. You will find How-To videos that address how to score your white-tailed deer, age determination,  how to harvest  your deer and many other deer management resources. The FNR videos and publications will give you step-by step guidance on how to receive accurate measurements and share best data collection practices, along with sharing what materials are needed.

Here is a quick list of just a few of our resources for those deer hunting enthusiasts:
Ask an Expert: Wildlife Food Plots, video, Purdue Extension – Forestry and Natural Resources (FNR) YouTube Channel
Handling Harvested Game: Episode 1, Field Dressing, video, Purdue Extension – FNR YouTube Channel
Handling Harvested Game: Episode 2, Hanging & Skinning, video, Purdue Extension – FNR YouTube Channel
Handling Harvested Game: Episode 3, Deboning, video, Purdue Extension – FNR YouTube Channel
Handling Harvested Game: Episode 4, Cutting, Grinding & Packaging, video, Purdue Extension – FNR YouTube Channel
Deer Harvest Data Collection, Got Nature? Blog, Purdue Extension – FNR
How to Score Your White-tailed Deer, video, The Education Store, Purdue Extension Resource Center
White-Tailed Deer Post Harvest Collection, video, The Education Store
Age Determination in White-tailed Deer, video, The Education Store
Handling Harvested Deer Ask an Expert? video, Purdue Extension – FNR YouTube Channel
How to Build a Plastic Mesh Deer Exclusion Fence, The Education Store
Bovine Tuberculosis in Wild White-tailed Deer, The Education Store
Woodland Stewardship for Landowners: Managing Deer Damage to Young Trees, video, Purdue Extension – FNR YouTube Channel
Integrated Deer Management Project, Purdue FNR

For other hunting and trapping dates view the Indiana Department of Natural Resources, Fish and Wildlife Department website. Enjoy and stay safe!

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

Rod Williams, Assistant Provost for Engagement/Professor of Wildlife Science
Purdue University Department of Forestry and Natural Resources

Jarred Brooke, Wildlife Extension Specialist
Purdue Forestry and Natural Resources

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Indiana Forestry & Woodland Owners Association (IFWOA) is a non-profit organization dedicated to conservation and sustainable management of forests in Indiana. The Fall Leaves & Limbs Newsletter is now available online and is open to all who would like to view the articles and resources.

Fall 2023 Leaves & Limbs Newsletter includes:

• Nesting and Overwintering Habitat for Pollinators and other Beneficial Insects
• Upcoming forestry events
• Chainsaw workshop for Woodland Owners
• Deam Finalists’ Excellent Stewardship to be Honored
• Series of Webinars Discuss Timber Taxes
• 2023 Woodland Owner Conference November 3-4 in Jasper/Huntingburg: Highlights, Agenda, Registration, Hotel
• Report Wilting Sassafras
• Emerging Invasive Plants of the Midwest

More About IFWOA
IFWOA is hosting the Indiana Woodland Owner Conference with field programs and indoor sessions on wildlife and habitat, forest management, and other concerns of landowners. The conference is November 3-4 and is open to anyone, nearly 200 landowners are expected to attend. See the agenda and register at https://www.ifwoa.org/resources/annual-woodland-owner-conference/.

IFWOA advocates for scientific best practices for woodland management to achieve objectives like clean water, wildlife habitat, soil protection, native species diversity, timber production, recreation, carbon sequestration and many others.

This Indiana association has members in every county of Indiana both woodland owners and non-owners, city and rural dwellers, family farmers, wildlife conservationists, agriculture and forestry professionals, tree farmers, loggers, scientists, educators — anyone who cares about the health of Indiana forests and woodlands, and wants to assure those lands receive the care and support they need.

Membership in IFWOA provides a valuable network linkage to information and resources at the leading edge of science, industry and politics impacting Indiana woodlands. If you would like to learn more about membership view Join Today, Indiana Forestry & Woodland Owners Association (IFWOA).

Resources:
Subscribe: Indiana Forestry & Woodland Owners Association (IFWOA) YouTube Channel
“Magnificent Trees of Indiana” webinar with author Carroll Ritter, IFWOA YouTube Channel
Forest Improvement Handbook, The Education Store, Purdue Extension’s resource center
Planting Hardwood Seedlings – The Education Store
Ordering Seedlings from the State Forest Nursery System, Got Nature? – Purdue Extension-FNR
Importance of Hardwood Tree Planting – The Education Store, Purdue Extension Resource Center
Designing Hardwood Tree Plantings for Wildlife – The Education Store
ID That Tree – YouTube Playlist
Forest Management for Reptiles and Amphibians: A Technical Guide for the Midwest, The Education Store
Hardwood Ecosystem Experiment – Forest Birds , Purdue Extension – FNR YouTube Channel
Ask the Expert: Hardwood Ecosystem Experiment – Birds and Salamander Research, Purdue Extension – FNR
Subscribe to Purdue Extension-FNR YouTube Channel

Liz Jackson, Engagement Lead
Indiana Forestry & Woodland Association

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MyDNR, Indiana’s Outdoor Newsletter: The Indiana Cooperative Fish and Wildlife Research Unit, or CRU, that Purdue will host, brings together the U.S. Geological Survey, U.S. Fish and Wildlife Service, Purdue University, the DNR, and the Wildlife Management Institute.

Its focus will be on delivering actionable science addressing fish, wildlife, plants, and other natural resources in Indiana and beyond, including the connection between the health of wildlife and the health of people.

The CRU Program is results focused, bringing together natural resource managers and researchers to work as a team to address the most pressing natural resource management needs with science. As such, the partnerships formalized with the creation of CRUs lead to true co-production of research.

“The creation of this new unit is another milestone in the highly successful USGS Cooperative Research Units Program, and we are proud to join the state of Indiana, Purdue University, the USGS, Wildlife Management Institute, and others to address conservation questions facing Indiana and the region,” said U.S. Fish and Wildlife Service Science Applications Program Assistant Regional Director Craig Czarnecki. “We look forward to engaging with the students and professionals at Purdue University as we co-develop scientific research and support the next generation of conservationists.”

But CRUs don’t just tackle management needs. They do so while cultivating the next generation of scientists and resource managers. The new Indiana CRU will focus on education, training, and outreach related to natural resources vital not only to Indiana, but the Midwest and regional economies as well.

Like all CRUs, the Indiana CRU will consist of 2-5 federal scientists along with graduate students, postdoctoral fellows, and administrative specialists. Federal scientists will serve as faculty at Purdue University, teaching graduate-level courses, supervising graduate students and postdocs, offering workshops for students and cooperators, and conducting research on natural resources topics. Once created, each CRU formalizes research priorities, like aquatic conservation or wildlife disease. Indiana CRU partners will decide these in the coming months.

“We look forward to the tremendous opportunity that collaboration with the Indiana CRU will bring to our state and Purdue University,” said Karen Plaut, executive vice president of research at Purdue University. “It will have a direct impact on graduate education as well as research productivity and innovation.”

For full article please visit: The partnership is Indiana’s first U.S. Geological Survey Cooperative Fish and Wildlife Research Unit, Indiana DNR Calendar.

Sign up to receive the MyDNR Newsletter by email: MyDNR Email Newsletter

Resources:
Purdue Announces New USGS Cooperative Research Unit, Purdue Agriculture New
Wildlife Habitat Education Program: Wildlife Identification Guide, The Education Store, Purdue Extension resource center
Wildlife Habitat Education Program – Teaching and Learning Wildlife Management Practices, The Education Store
Wildlife Habitat Evaluation Program: Preparing for the Wildlife Challenge, The Education Store
Developing a Wildlife Habitat Management Plan, The Education Store
Woodland Wildlife Management, The Education Store
Purdue Integrated Deer Management Project, Purdue College of Agriculture
Purdue Extension-Forestry and Natural Resources (FNR) Publications
Indiana Pond Fish, Species Identification Card Set, Purdue Extension – Forestry and Natural Resources (FNR)
A Guide to Small-Scale Fish Processing Using Local Kitchen Facilities, The Education Store
Subscribe to Purdue Extension-FNR YouTube Channel
Invasive Species, Playlist, Purdue Extension – FNR YouTube Channel
What are invasive species and why should I care?, Got Nature? Blog, Purdue Extension – Forestry and Natural Resources
Invasive plants: Impact on Environment and People, The Education Store, Purdue Extension’s resource center

Indiana Department of Natural Resources, Department of Fish & Wildlife

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Purdue Landscape Report: Trees stressed by prolonged drought are more subject to attack by boring insects. This article provides tips and a video link on how to manage pines for borers.

Record breaking heat and sporadic rainfall during July of 2023 took their toll on landscape trees.  Cone bearing evergreens, like white pines, are especially susceptible to drought and flooding. These environmental stresses reduce the ability of trees to defend themselves against boring insects. To make matters even worse, insect borers use their keen sense of smell to guide them to these stressed trees. Trees often take several years to recover from drought. Monitoring trees for early signs of decline is critical to a successful management program.

Early intervention can help you keep infested trees from becoming a breeding ground for borers that can destroy an entire planting.  Trees that are more than half dead, or those whose needles are mostly yellow are usually too damaged to save. Removing these trees in late fall and winter removes the reproducing borers from the landscape before borers they can emerge to attack healthy trees.  As an extra protective measure, insecticides can be applied on to the trunk to kill boring insects chewing into or out of the trees.  Apparently healthy trees located near borer-infested trees can also benefit from a soil applied insecticides, like imidacloprid or dinotefuran applied in fall and early spring.

Zimmerman pine moth (ZPM)commonly attacks pine trees in late July. Adult female moths lay eggs at the junction of tree branches and the trunk and winters in cracks and crevices. In early spring, when forsythia bloom, larvae bore inside the trunk and can girdle and kill branches and trees leaders. These are the two times of year that this borer is most susceptible to insecticides. Note soil applied imidacloprid is not particularly effective against ZPM.  Spruces and most pines are susceptible to this borer.

To view this full article and other Purdue Landscape Report articles, please visit Purdue Landscape Report.

Subscribe and receive the newsletter: Purdue Landscape Report Newsletter.

Resources:
Borers of Pines and Other Needle Bearing Evergreens in Landscapes, The Education Store
Normal Needle Drop: Even Healthy Evergreens are not Evergreen, Purdue Landscape Report
White Pine Decline in Indiana
Tree Defect Identification, The Education Store
Tree wounds and healing, Got Nature? Blog
Tree Risk Management – Got Nature? Blog, Purdue Extension – FNR
Why Is My Tree Dying? – Got Nature? Blog, Purdue Extension – Forestry and Natural Resources
Managing the Zimmerman Pine Moth, The Education Store
The Woody Plant Seed Manual, U.S. Forest Service
Native Trees of the Midwest, Purdue University Press
Investing in Indiana Woodlands, The Education Store
Forest Improvement Handbook, The Education Store
Find an Arborist, International Society of Arboriculture
Subscribe Purdue Extension-Forestry and Natural Resources YouTube Channel

Cliff Sadof, Professor, Ornamental, Pest Management
Purdue Entomology Extension Coordinator

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Purdue Landscape Report: Stop me if you’ve heard this one…. A tree is in a slow decline year after year. You are called to your client’s property only to find the root flare well below grade.

Most professionals in the Green Industry have encountered this at some point in their career. The most common reason for the slow decline of trees in the landscape is due to the depth of planting and girdling roots. Deep planting can cause a number of deleterious problems, including an increase in circling/girdling roots restricting vascular tissue and decay of protective bark (Fig. 1). The vascular tissue in the bark is located on the outer portions of the trunk, while the anatomy of roots contains the vascular tissue in the center. This is why roots can graft with roots and stems can graft with stems, but also why roots can girdle the stems of trees (Fig. 2)

Excessive mounding of mulch (aka volcano mulch) (Fig. 3) can contribute to tree decline, very similar to a tree planted too deep. It’s important to remember that keeping mulch several inches away from the trunk is imperative in tree health.

If a newly transplanted tree is planted significantly too deep, a faster decline can occur, especially in plants that can’t tolerate ‘wet feet’ (aka too much soil moisture) (Fig.4). In heavy-clay soils, the negative effects on tree health increase by creating a bath-tub situation by water not draining expeditiously after a rainfall or irrigation event.

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