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Purdue Landscape Report: Have you noticed large, messy webs on trees? You may have seen a colony of fall webworms. These caterpillars hatch in mid-July but tend to become more noticeable as the summer progresses. They often eat branches bare of leaves but are they a threat to tree health?

What do they look like?

Fall webworms are small, fuzzy pale-yellow caterpillars (figure 1) that build large, conspicuous white webs in trees in the late summer (figure 2). Their webs stretch over tree branches and grow over the course of the summer. When disturbed, the caterpillars will violently thrash back and forth in a bid to ward off predators.

What kind of damage do they cause?
Fall webworms eat the leaves of many species of deciduous trees and bushes. This damage occurs late in the summer shortly before the trees normally drop their leaves for fall. Therefore, fall webworms very rarely do serious damage to trees. In most cases the trees will grow their leaves back the following spring. On rare occasions, a tree that is already highly stressed may be further weakened by fall webworm damage. However, most trees, even heavily infested trees, are minimally affected and show no signs of damage the following spring.

Do they need to be managed?
Fall webworm damage generally looks much worse than it is. In general, trees only need to be managed for fall webworm if the owner is concerned about aesthetics. In that case, the easiest means of management is pulling the web off the tree by hand and putting it in a bucket of soapy water or freezing it. Some people may be sensitive to the caterpillars’ hairs so gloves should be worn to prevent contact.

In cases where the webs are too high up to be reached, they can be managed through insecticides. Further instructions can be found here.

Cover image by Photo by msumuh on Flickr.

Resources
Fall Webworm Bulletin, Purdue Extension -Entomology
Which Web is Which, Purdue Landscape Report
Will My Trees Recover After Losing Their Leaves?, Purdue Landscape Report
Safe Caterpillar Control, Purdue Landscape Report
Mimosa Webworm, The Education Store, Purdue Extension resource center
Sod Webworms, Turf Science at Purdue University
Bagworm caterpillars are out feeding, be ready to spray your trees, Purdue Extension – Forestry and Natural Resources

Elizabeth Barnes, Exotic Forest Pest Educator
Purdue University Department of Entomology

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Join Kara Salazar, Assistant Program Leader and Extension Specialist for Sustainable Communities, and Sarah Hanson, Ag & Natural Resources Educator for Purdue Extension in Johnson County, as they introduce you to the world of rainscaping and rain gardens.

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
Rainscaping Education Program, Purdue University
Master Gardeners Program
Ask An Expert, Playlist, Purdue Extension – Forestry and Natural Resources Youtube channel
Rainscaping, Playlist
Rain Gardens Go with the Flow, Indiana Yard and Garden, Purdue Horticulture
Rainscaping Education Program Highlighted in NOAA Annual Report, Got Nature? Post, Purdue Extension
What is Rainscaping? Purdue Rainscaping Education Program Video, Purdue Extension
Q&A About Drainage Water Recycling for the Midwest,  The Education Store, Purdue Extension resource center
Become a Purdue Master Gardener, The Education Store

Kara Salazar, Assistant Program Leader and Extension Specialist for Sustainable Communities
Department of Forestry and Natural Resources

Sarah Hanson, Ag & Natural Resources Educator
Purdue Extension for Johnson County

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Join Purdue Extension wildlife specialist Jarred Brooke as he talks about all things regarding planting wildlife food plots. This includes a step by step guide from planning to planting, explanation of types of food plots, types of seed, seed mixes and more.

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
Calibrating a No-Till Drill for Conservation Plantings and Wildlife Food Plots, video, Purdue Extension
Frost Seeding to Establish Wildlife Food Plots and Native Grass and Forb Plantings, video, Purdue Extension
Now is the time to sow native grass and forbs seeds. Here’s why. Got Nature? Blog, Purdue Extension – Forestry and Natural Resources
Habitat Help LIVE Q&A – Native Grasses and Forbs for Wildlife, Video, Purdue Extension – Forestry and Natural Resources Youtube channel

Jarred Brooke, Wildlife Extension Specialist
Purdue Department of Forestry and Natural Resources

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In this edition of ID That Tree, Purdue Extension forester Lenny Farlee introduces you to the large tooth or big tooth aspen. This tree needs full sunlight and often thrives in areas where the soil has been disturbed. The leaf stems are long and flat which allow them to flutter in the wind.

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

Resources
ID That Tree, Playlist, Purdue Extension – Forestry and Natural Resources Youtube Channel
A Woodland Management Moment, Playlist, Purdue Extension – Forestry and Natural Resources Youtube Channel
Aspen, The Education Store, Purdue Extension resource center
Investing in Indiana Woodlands, The Education Store
Tree Appraisal and the Value of Trees, The Education Store
Forest Improvement Handbook, The Education Store

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

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Meet the Hackberry. Purdue Extension forester Lenny Farlee introduces you to this native tree with single toothed leaves, an uphill/downhill shaped base of the leaves and a gray, ashy bark with warty/bumpy areas with smooth spots in between.

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

Resources
ID That Tree, Playlist, Purdue Extension – Forestry and Natural Resources Youtube Channel
A Woodland Management Moment, Playlist, Purdue Extension – Forestry and Natural Resources Youtube Channel
Hackberry/Sugarberry, The Education Store, Purdue Extension resource center
Investing in Indiana Woodlands, The Education Store
Tree Appraisal and the Value of Trees, The Education Store
Forest Improvement Handbook, The Education Store

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

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May IDNR Wildlife Bulletin Newsletter: Do you know what to do if you find an injured wild animal? The first step is determining if it is actually injured. Clear signs of distress include:

• Bleeding or clear signs of injuries such as bruises, cuts, punctures or broken bones
• Looks thin, weak, cold or soaking wet
• Signs of diarrhea
• Flies, fly eggs, maggots, ticks, lice or fleas have infested the animal

If a wild animal shows any of these signs and is unable to move or run away effectively, it may be time to call a licensed wildlife rehabilitator for help. You can find a list of wildlife rehabilitators on IDNR Orphaned & Injured Animals website.

Please note that the Indiana DNR does not provide services for injured or orphaned wildlife. We rely on licensed wildlife rehabilitators to assist with these situations.

Resources
Orphaned & Injured Animals, Indiana Department of Natural Resources (IN DNR)
Resourceful Animal Relationships, The Education Store, Purdue Extension resource center
Wildlife, Playlist, Purdue Extension – Forestry and Natural Resources (FNR) YouTube channel
How to Stop Woodland Animals from Digging in Your Flower Pots, Got Nature? Blog with video, Purdue Extension FNR
Considerations for Trapping Nuisance Wildlife with Box Traps, The Education Store

Indiana Department of Natural Resources (IN DNR)

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Across the globe, most vulture species are declining dramatically. This is concerning because vultures provide valuable ecosystem service by cleaning the environment of carrion, thereby reducing disease risk for humans and livestock. In contrast to most other vulture species, populations of the American black vulture have grown and expanded into new areas during the past several decades. This has created the potential for conflict because black vultures have been documented to kill weak or newborn livestock.

The Purdue Forestry and Natural Resources’ research team seeks to better understand vulture ecology to inform conservation of other vulture species, as well as to understand how best to minimize conflict between vultures and producers by investigating what factors place some farms at greater risk.

What to do if you lose an animal:
• Take lots of pictures from every angle.
• If scavengers are around, move the carcass somewhere they cannot access.
• Call or text Marian Wahl at (317) 647-5294 as soon as you can. Marian is a graduate research assistant working with Pat Zollner, professor of wildlife science.

Thank you for your help as we gather livestock loss due to vultures in the states of Indiana and Kentucky.

To view, print and share flyer: Loss of Livestock to Vultures.

Resources
Livestock, Education Store, Purdue Extension resource center
Dr. Pat Zollner Research, Purdue Forestry and Natural Resources
Wildlife Research, Purdue Forestry and Natural Resources

Marian Wahl, Graduate Research Assistant
Purdue Department of Forestry and Natural Resources

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In this “A Moment in the Wild” episode, Nick Burgmeier, Purdue Extension wildlife specialist, talks about the practice of rock stacking and how it affects the habitat of stream-dwelling species.

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
A Moment in the Wild, Playlist, Purdue Extension – Forestry and Natural Resources
Help the Hellbender, Playlist & Website
The Nature of Teaching: Adaptations for Aquatic Amphibians, The Education Store, Purdue Extension resource center
How Our Zoos Help Hellbenders, The Education Store
Help the Hellbender, North America’s Giant Salamander, The Education Store

Nick Burgmeier, Research Biologist and Wildlife Extension Specialist
Purdue Department of Forestry and Natural Resources

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Illinois-Indiana Sea Grant (IISG) Newsroom: With the prolonged pandemic continuing to affect the United States, traditional education has turned toward at-home learning and virtual classrooms to keep students safe. Now more than ever, teachers must be able to find lesson plans for their students that are adaptable to different learning environments and cover topics required by the curriculum. To meet these needs, Illinois-Indiana Sea Grant (IISG) has created a weather and climate education toolkit where teachers can find resources on the topics of weather, climate and climate change.

IISG developed the weather and climate education toolkit with support from the Center for Great Lakes Literacy and the Midwestern Regional Climate Center.

*Illinois-Indiana Sea Grant is a part of University of Illinois Extension and Purdue Extension.

Resources
Climate Resources – Institute for a Sustainable Future
The Nature of Teaching, Purdue Extension
Trees and Storms, The Education Store, Purdue Extension resource center

Illinois-Indiana Sea Grant (IISG)

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In a previous job, I helped landowners enroll in and implement private land conservation programs like the Conservation Reserve Program. Much of my job centered around talking with landowners about how to establish and manage native grass and forb (wildflower) plantings for wildlife. Even in my job today, I provide educational opportunities including seminars, field days, and workshops centered on this topic.

One of the most common emails, phone calls, and questions I get when talking about establishing these plantings revolves around evaluating the planting during the first year.

Typically, the inquires go like this “I planted native grasses and wildflowers for wildlife this spring, and now I just have a field of weeds! Did the planting fail?” or “Nothing I planted this spring is growing!”

Following these flustered phone calls and frantic emails, I usually do a site visit with the landowner to help them evaluate their planting. Below are the four things I look for when evaluating a new native grass and wildflower planting.

Before we get into the things I look for during an evaluation, it’s important to note that native grass and wildflower plantings for wildlife typically take 2-3 years to establish. So, what you see in year one, may not be what you get in year two, three, or four. But, there are a few signs you can use to monitor your planting’s progress.

1. Weed pressure
Inevitably when you plant these diverse mixes of native grasses and wildflowers you will get weeds. Even if you control weeds before planting (which you should), some weeds will still show up, especially annual weeds like foxtail, ragweed, and horseweed. In the past, we used herbicides like imazapic (Plateau) to help control weeds during the first growing season after planting – which is still an option in native grass only stands or with certain wildflowers. But, with more diverse plantings we do not have any herbicide options to control weeds without harming what we planted. Therefore, weeds may be more of an issue in diverse plantings like pollinator plantings.

Controlling these weeds may require mowing during the growing season before they produce seed, which can help planting success. But this mowing can come at a cost. Many of these weeds like common ragweed, provide cover and food for wildlife. Mowing the field may temporarily reduce its value to many wildlife species. When evaluating weed pressure, we need to decide if weeds are dense or thick enough to reduce the germination and growth of what we planted. Generally, if the weed pressure in the field is high and it is shading out the ground, you should think about mowing to control weeds. If weed pressure is not high and sunlight is still reaching the ground, you may want to consider skipping or delaying the mowing until later in the summer.

 

2. Look for rows or drill marks
If you plant the field with a no-till drill, you may see rows of plants appear during the first growing season. This is a sure indication that what you planted has germinated and is growing. However, if you frost seeded the field by broadcasting the seed on top of the ground, you will not see rows. Sometimes the rows of plants will not be obvious at first, but will be very obvious later on.

 

3. Identify indicator plants
One the best ways I could calm the nerves of a landowner who thought they had a failed planting was by identifying species of wildflowers or grasses that they did indeed plant. Some of the annual or biennial wildflowers such as black-eyed susan or partridge pea will germinate quickly and may even flower during the first growing season. Learning how to identify some of the species you planted will help you determine if what you planted is indeed germinating and growing.

 

4. Scout for invasives
Another topic of discussion on a site visit is invasive plants. It is important to catch invasive early in a planting so they do not cause problems later on. Some of the common invasive plants that show up early in the life of native grass and wildflower planting are Canada thistle, sericea lespedeza, and johnsongrass. Control of these species often requires herbicide. Catching them early when they can be spot-sprayed will save you time, money, and headaches.

Looking for these four signs when evaluating your newly established planting can help you determine if it’s on the right track and help you keep it there. But, many of the species you planted are perennials, and will not be very obvious the first growing season. They are putting most of their energy towards below ground (roots), not above ground (stems) growth. So, if you don’t see them during the first growing season, it doesn’t mean they are not there. Establishing a native grass and wildflower planting for wildlife takes a bit of patience and persistence.

Video: Tips for Evaluating a First Year Native Grass and Forb Planting expands even further regarding the tips on how to evaluate your first-year planting.

Resources
Purdue Extension Pond and Wildlife Management Website
Renovating Native Warm-Season Grass Stands for Wildlife: A Land Manager’s Guide, The Education Store, Purdue Extension resource center
Calibrating a No-Till Drill for Conservation Plantings and Wildlife Food Plots, Video
Habitat Help LIVE Q&A – Native Grasses and Forbs for Wildlife, Video, Purdue Extension – Forestry and Natural Resources Youtube channel

Jarred Brooke, Wildlife Extension Specialist
Purdue Department of Forestry and Natural Resources

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