Got Nature? Blog

Posted on September 4th, 2015 in Drought, Forestry | No Comments »

Trees in Times of Drought Video Water is the most limiting ecological resource for a tree, and without adequate moisture, decline and death are imminent. Drought can have a major impact on tree health and survival. It reduces carbohydrate production, significantly lowering energy reserves and production of defense chemicals in the tree.

Trees in a weakened state from drought are more susceptible to pests, which can further weaken the tree, and even kill part or all of it. Although there is nothing we can do to prevent drought, it is important to know what can be done to reduce long-term effects of prolonged dry conditions.

Urban Forestry Specialist Lindsey Purcell describes how homeowners can deal with drought-stressed trees in the short-term and long-term in his publication “Drought? Don’t Forget the Trees!” Purcell also provides insight on the state of Indiana’s drought-stressed trees and how to protect them in the video “Trees in Times of Drought​.”

Resources:
Trees in Times of Drought​, Video, Purdue Agriculture
Drought Information​, Indiana Department of Natural Resources
Drought? Don’t forget the trees!, The Education Store
Corn Belt Farmers’ Concerns About Drought and Heat-related Threats to Their Farm Operations, Sustainable Corn
Safety Harvesting Quality Forage in a Drought, The Education Store
Planting Your Tree Part 1: Choosing Your Tree, Purdue Extension YouTube Channel
Tree Defect Identification, The Education Store
Tree Wound and Healing, Got Nature? Blog, Purdue Extension – Forestry and Natural Resources
Surface Root Syndrome, The Education Store
Planning the Tree Planting Operation, The Education Store
Tree Risk Management – Got Nature? Blog, Purdue Extension – FNR
ID That Tree, Purdue Extension-FNR YouTube playlist
Subscribe – Purdue Extension-FNR YouTube Channel

Lindsey Purcell, Chapter Executive Director
Indiana Arborist Association

Posted on August 20th, 2015 in Drought, Forestry, Urban Forestry | No Comments »

Indiana has experienced extreme weather over the last couple of years. Extreme heat, draught, cold, winds, you name it, we’ve dealt with it. Most recently, through June and July, Indiana has experienced record-breaking rainfall and flooding. These weather conditions can make it difficult for our surroundings, but it can also cause a lot of stress on our trees.

Maple Tree

Photo credit: Keith Robinson

Urban trees are more susceptible to weather-related injury because of their oftentimes compromised root systems. In forested areas, trees spread their roots out two to three times the length of the tree. This is important because roots are the tree’s way to receive oxygen from the soil. This provides for a healthy defense system, giving the tree advantages like the ability to draw in moisture during dry spells and secrete fungi- and insect-repelling chemicals. In urban areas, roads and construction oftentimes sever roots or restrict where they can go, leaving the trees in a vulnerable state.

Our vulnerable urban trees are especially likely to be harmed by weather-induced stress. Symptoms like browning of leaves, dying branches and early coloration in the fall are all signs that a tree’s health is declining.

Keep an eye on your trees, and if you are concerned, use the Purdue Tree Doctor app​ or submit a sample to the Purdue Plant and Pest Diagnostic Lab as you seek best practices to care and protect your trees.

Resources
Purdue Experts: Tree Deaths Across Indiana May be Related to Weather Stress, Purdue Agriculture News
Drought? Don’t forget the trees! The Education Store, Purdue Resource Center
Plan Today For Tomorrow’s Flood, The Education Store
Community & Urban Forestry, Indiana Department of Natural Resources
The Root of the Problem, Northern Woodlands

Purdue University Agriculture News

Lindsey Purcell, Urban Forestry Specialist
Department of Natural Resources, Purdue University

B. Rosie Lerner, Extension Consumer Horticulture Architecture
Department of Horticulture and Landscape Architecture, Purdue University​

Posted on August 6th, 2015 in Forestry, How To, Urban Forestry | No Comments »

Tree PruningTrees continue to survive in spite of the many challenges they face in the urban environment. However, to grow from seedling to a mature tree in the urban forest, they need our help. They are the largest, oldest living organisms on the planet and can live long, healthy lives with some assistance. We often place trees in less-than-favorable growing locations that don’t allow natural development and maturity and often require pruning to develop a durable structure, improve clearance and maintain aesthetics.

Pruning has been called “one of the best, worst maintenance practices” performed on trees. The process creates wounds, which have a major impact on plant processes. Improper cutting on a tree causes severe damage or even death. To prune properly, it is important to understand both the proper techniques and how the tree responds to pruning.

In this publication, Urban Forestry Specialist Lindsey Purcell explores the techniques behind good pruning, from the planning process before planting to monitoring the tree’s response after the pruning cuts. Check out Tree Pruning Essentials and make sure you are pruning your trees to maximize safety, aesthetics and tree health!

Resources
Tree Pruning Essentials, Purdue Extension
Tree Pruning Essentials Video, Purdue Extension
Trees and Storms: Understanding Damage, Risk and Recovery – Got Nature? Blog, Purdue Extension – FNR
Tree Risk Management – Got Nature? Blog, Purdue Extension – FNR
Pruning, Indiana Department of Natural Resources
Prune Your Trees, Indiana Department of Natural Resources

Lindsey Purcell, Urban Forestry Specialist
Department of Natural Resources, Purdue University

​

Tree of Heaven Seedling

Tree-of-heaven seedling

​Invasive plant species threaten many habitats including forests across Indiana. The introduced Asian tree-of-heaven (Ailanthus altissima) is one of these aggressive and troublesome invaders. Tree-of-heaven grows very quickly on a wide variety of sites from seed and sprouts and can rapidly out-compete native trees and shrubs. There are areas in Indiana forests already dominated by this unwelcome invader. Controlling large infestations of this tree can be very expensive and even dangerous. The sap and wet sawdust of this tree can trigger an allergic reaction in some people.

There is some hope on the horizon. Research work done by the U.S. Forest Service and universities in Pennsylvania and Ohio has identified a fungus that can kill tree-of-heaven and has minimal or no impact on surrounding plants. Verticillium nonalfalfae or Ailanthus verticillium wilt is a soil fungus that has been identified so far in Pennsylvania and Ohio that can rapidly kill large patches of tree-of-heaven. Tests with this naturally occurring soil fungus have shown it to be very effective at killing tree-of-heaven without having significant impacts on surrounding native plants.

This naturally-occurring killer of tree-of-heaven could be an important tool in managing this invasive problem in Indiana. The quickest way to get started with natural bio-control of tree-of-heaven is to locate the fungus here in Indiana. Citizens and resource professionals can help us locate ailanthus verticillium wilt by identifying patches of tree-of-heaven that are being impacted by the fungus. This requires familiarity with the identification of both tree-of-heaven and the symptoms of the wilt disease on the tree.

Tree of Heaven Closeup

Close-up of the “teeth” on the leaves of tree-of-heaven

Tree of Heaven has long, compound leaves resembling sumac or black walnut but possessing small notches or teeth at the base of the leaflets. The plant parts have a very unpleasant burnt nut odor when crushed or bruised. The bark is smooth and grey with light grey or white fissures running vertically in the bark. Twigs are very stout with a light tan spongy pith in the center.

Ailanthus wilt causes rapid death of the tree, often within one season, so look for patches of tree-of-heaven where most trees are showing wilting foliage or are already dead. The mortality will often be radiating out from a central group of dead or dying trees. Trees with wilt will have a yellow to yellow-brown discoloration of the wood directly beneath the bark. Healthy tree-of-heaven will have nearly white wood under the bark. The mortality will almost always be groups of trees, not scattered individuals. Several resources are included below to help you identify tree-of-heaven and ailanthus wilt.

If you encounter what you think is ailanthus wilt in Indiana, please contact:
Lenny Farlee, Hardwood Ecosystem Extension Specialist
Purdue Forestry and Natural Resources
Email: lfarlee@purdue.edu
Phone: 765-494-2153

Joanne Rebbeck, Plant Physiologist
USFS, Northern Research Station
Email: jrebbeck@fs.fed.us
Phone: 740-368-0054

Resources
Tree-of-heaven Images, Center for Invasive Species and Ecosystem Health
Scientists Using Fungi to Stop an Invader​, The Columbus Dispatch
Verticillium nonalfalfae, USDA Forest Service
Invasive Species, Purdue Extension​
The Education Store, Purdue Extension Resource Center (search “invasive”)

Lenny Farlee, Hardwood Ecosystem Extension Specialist
Department of Forestry and Natural Resources, Purdue University

Poison Hemlock

Photo credit: Pedro Tenorio-Lezama, Bugwood.org

Made infamous through the trial of Socrates, Shakespeare’s Hamlet and Macbeth, and several other works of classic literature, poison hemlock is an extremely toxic plant that will pose a risk this summer and should be handled with caution.

Poison hemlock is a biennial plant, meaning that it has a two year lifespan. Last summer, it went through vegetative growth and largely stayed out of sight. This summer, it will produce small white clusters of flowers and will be more likely to catch the attention of animals and people. Poison hemlock is a member of the parsley family and can sometimes be confused with wild carrot. However, its distinguishing feature is its hairless hollow stalks with purple blotches. If you see these, be careful!

The biggest risk with poison hemlock is ingestion. Lethal doses are fairly small, so it is important for animal owners or parents of young children to identify it in their area and remove it if possible. The toxins can also be absorbed through the skin and lungs, so be sure to wear gloves and a mask when handling these plants.

Symptoms of hemlock poisoning include dilation of the pupils, weakening or slowing pulse, blue coloration around the mouth and eventually paralysis of the central nervous system and muscles leading to death. Quick treatment can reverse the effects, so act quickly.

Resources
Invasive Plant Species Fact Sheets: Poison Hemlock, The Education Store, Purdue Extension Resource Center
Recognizing and Managing Poison Hemlock, Purdue Landscape Report
Poison Hemlock, Pest & Crop Newsletter, Purdue Extension – Entomology
Hemlock Woolly Adelgid: Distribution Update, Purdue Landscape Report
What are Invasive Species and Why Should I Care?, Purdue Extension – Forestry and Natural Resources (FNR)
Indiana Invasive Species Council
Report INvasive, Purdue Extension & Indiana Invasive Species Council
Poison Hemlock (Conium maculatum), United States Department of Agriculture (USDA)

Purdue Extension

Posted on July 16th, 2015 in Forestry, Plants, Urban Forestry | No Comments »
Aime and Fungi

Photo: Tom Campbell

Mushrooms are strange forms of life. Some can kill you within hours, some are psychedelic hallucinogens and others are just good on a pizza. There are estimated to be six to 20 times more species of fungi than plants, and a lot of them are still shrouded in mystery. Since the time of Carl Linnaeus in the 1700s, we have been searching for answers in the fungi kingdom, and recently, we just found a big one in the shape of an evolutionary mapping dubbed the “tree of life.”

Using collections of preserved fungal specimens called fungaria from Purdue’s Arthur Fungarium and Kew’s Fungarium in the Royal Botanic Gardens, two of the biggest and most important fungi collections in the world, mycologists like Catherine Aime were able to study well over 100 years’ worth of preserved specimens and apply modern DNA technology to piece together genomes and discover new connections linking mushroom species. This “tree of life” is the clearest and most comprehensive mapping to date of the evolutionary history of fungi.

Aime says that this study reinforces the importance of fungaria as we advance in the genomic age. These extensive collections are priceless, containing specimens as far back as some from Darwin himself, and documenting hundreds of thousands of species throughout the years. Some of these species might not exist in the future, and it is essential that we document and preserve them as we learn new ways to use them in the future.

The research paper documenting this ‘tree of life’ was published in the Biological Journal of the Linnean Society​ and is available for journal subscribers and readers at Purdue.

Read the full article.

Resources
DNA Samples From Purdue, Kew Fungi Collections Provide Key to Mushroom ‘Tree of Life’, Purdue Extension
Arthur Fungarium, Purdue Herbaria
Kew’s Fungarium, Kew Royal Botanic Gardens
Aime Lab, Purdue University Department of Botany and Plant Pathology
Fungi – In a Kingdom All By Themselves, Indiana Department of Natural Resources

Natalie van Hoose, Research News Writer
Purdue Extension​

Posted on July 14th, 2015 in Forestry, Invasive Insects | No Comments »
Emerald Ash Borer

An adult emerald ash borer feeds off a leaf. (Purdue University Department of Entomology photo/John Obermeyer)

Article by Pat Munsey, taken from KokomoPerspective.com:

The ash borer beetle is a scourge that has spread across the Midwest for more than a decade, laying waste to trees as it burrows and feeds. Now it is in Howard County.

Ash trees in several areas of the community are showing signs of the inevitable death that comes with infestation, but citizens can stop the pest in its tracks.

According to the Indiana Department of Natural Resources (DNR), the beetles were first discovered in Indiana on April 21, 2004. Since that time, it has steadily spread across the state with heavy concentrations in the northeast. Evidence of the insects’ arrival locally began appearing two years ago, and according to Kristy McNeil, an associate at Salsbery Garden Center, it is vital that people take action now to prevent further damage.

Resources
Emerald Ash Borer, Indiana Department of Natural Resources (IDNR)
Emerald Ash Borer in Indiana, Purdue Extension

Posted on July 10th, 2015 in Forestry, Urban Forestry | No Comments »

River Scene​Historically, forests dominated the land of Indiana, covering about 85% of Indiana prior to European contact and settlement. However, now less than 25% of our forested areas remain—and more than 85% of those areas are privately owned.

Urban woodlots are steadily in decline, both in number and size. The development of businesses and residential areas, highway construction and expansion and increases in cropland are all causes of destruction and reduction of these woodlots. When privately owned woodlots drop below 10 acres in size, they receive much less support and can’t qualify for the Classified Forest and Wildlands program through the Indiana Department of Natural Resources, forcing their owners to manage them on their own.

Owners of woodlots of all sizes can help protect and improve them with good management and stewardship practices. Adding trees and other plant life, taking care of diseases and other pests and harvesting products when needed are all great steps towards urban woodlot preservation.

The benefits of urban woodlots don’t just help their owners but the entire community around them. Forested areas reduce the impact of rainfall on land, decreasing flooding, erosion and the removal of topsoil. The quality of water is improved as sediment and pollutants are filtered out. Soil is added as plants decay. Air is improved as plants soak in carbon dioxide and other unwanted chemicals. Trees provide shade and reduce wind speed, reducing the need for burning fuel. And of course, woodlots provide habitats that many animals depend on.

Urban woodlots really are crucial for our environment. As it decreases around us, it is important that we know what we can do to protect and improve what we have left. Owners of private urban woodlots must stay informed to keep their property not only beneficial to them economically, but beneficial to our society as a whole.

For more information, view the free publication download titled Indiana’s Urban Woodlots.

Resources
Indiana’s Urban Woodlots, The Education Store, Purdue Extension Resource Center
Urban Forestry – Got Nature?, Department of Forestry and Natural Resources, Purdue University
The Indiana Woodlot Owner Series, Indiana Department of Natural Resources (IDNR)
Indiana Arborist Association (IAA)

Lindsey Purcell, Chapter Executive Director
Indiana Arborist Association

Posted on July 3rd, 2015 in Forestry, Urban Forestry, Wildlife | No Comments »

HEE - BirdThe focus of forest science is increasingly shifting to the management of forests as complex systems rather than as simple agricultural landscapes—with a much greater appreciation for the interactive ecosystem processes. In addition, now for many forest landowners, the ecological value of their land is at least as important as the economic return. It is, therefore, vital to understand how forest management affects not only timber production, but also the overall function of forested ecosystems.

This new publication, Breeding Birds and Forest Management: the Hardwood Ecosystem Experiment and the Central Hardwoods Region, summarizes the effects of forest management on bird species in the Midwest based on data collected as part of the Hardwood Ecosystem Experiment (HEE) in southern Indiana and other studies. We hope this summary provides a basis for understanding interactions between forest management and forest birds as well as guidelines for bird-friendly forest management in Indiana.

Resources
Hardwood Ecosystem Experiment
Hardwood Tree Improvement and Regeneration Center (HTIRC)
The Education Store, Purdue Extension Resource Center

Hardwood Ecosystem Experiment

Forests and woodlots are constantly changing. To get the most out of your property to meet your wildlife, recreational, aesthetic or economic goals, some type of regular management will be necessary. Getting the most out of your woods can be a challenge on your own. Fortunately, there are many resources available to help you.

A professional can help plot the best course of action for meeting your ownership objectives while keeping your woods healthy. Your selection of a professional depends on what services you need and the size of your property. Ten (10) acres is a threshold for where you go in Indiana.

More than 10 acres

  • The Directory of Professional Foresters is a service provided by the Indiana Forestry & Woodland Owners Association. For this directory, the term “professional forester” means a person who has successfully completed a four year college level curriculum accredited by the Society of American Foresters and has received a Bachelor’s Degree in Forestry from that accredited institution.
  • The Indiana DNR Division of Forestry provides private forestland management assistance through District Foresters who are professionally trained to manage forestland for the many resources it can provide. District foresters administer both state and federal programs that provide technical assistance, property tax incentives, and cost-sharing incentives for applying practices that accomplish sustainable management.
  • Foresters can help answer some of your tax questions. The National Timber Tax Website is another good resource. The National Timber Tax Website was developed to be used by timberland owners, as well as a reference for accountants, attorneys, consulting foresters and other professionals who work with timberland owners regarding the tax treatment of timber related activities.

Less than 10 acres and Backyards

  • The Indiana Division of Forestry has a woodlot owner series that provides basic information for anyone who owns a small woodlot or backyard woods.
  • Because of the scale of operation, it can be difficult to get professional services from a forester for small woodlots. In most cases, tree harvests and other improvement cuts are set up directly with loggers. The Indiana Hardwood Lumberman’s Association has a Find a Logger database online.

Selling Timber

Selling timber from yards or small tracts of woodland present some challenges.

Forest Management for the Private Woodland Owner Course

The Forest Management for the Private Woodland Owner course provides forest landowners eight learning sessions designed to introduce them to the biology and management of forests, and the resources and professional assistance they can access to help them form their property management goals and pursue their objectives. Field experiences are integrated into the course to provide in-person, hands-on connections with the biology and management of Indiana forests. Connections made during the course and field tours introduce landowners to the foresters and other natural resource professionals who can help them with the management of their forestland. This course is offered in-person at varying locations around the state and also as an online version with live question-and-answer sessions. Courses normally run between January and April, so check the Purdue Extension – FNR Got Nature Blog and Upcoming Events sites for dates and registration information.

Explore the Rich World of Oaks with Purdue FNR Extension & Partners

Discover a comprehensive suite of oak-focused resources curated by Purdue Forestry and Natural Resources Extension to support landowners, educators and natural resource professionals. From expert-reviewed publications and engaging videos to insightful webinars and podcasts, our oak resources cover everything from species identification and forest stewardship to wildlife habitat management and oak regeneration techniques, Explore the Rich World of Oaks.

Get connected with other Indiana landowners!

Woodland owners often learn the most from people who are in their situation – fellow woodland owners. Several groups provide different ways to connect and have different resources. Explore the following to find out which group(s) fits your needs.

Invasive Species

Invasive species present a serious threat to the health and productivity of trees and forests. You can learn about recognition, reporting, and management of the invasive species found in forests at these sites:

Forestry Videos on Purdue Extension – FNR YouTube Channel

Got Nature?

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