Sasha CampbellYou may have noticed large, silky webs with caterpillars inside your trees and bushes lately. These are likely created by fall webworms (Hyphantria cunea).
In this post, we will discuss some natural ways to get rid of them. We will also provide tips on how to prevent them from taking over next year.
What Are Fall Webworms?
Fall webworms are often mistaken for eastern tent caterpillars, which mainly appear in spring. However, you can find fall webworms in the northern United States and Canada from late summer to early fall.
They’re the larvae of a moth [1], and they build noticeable webs in ornamental trees and shrubs.
The good news is that they’re not harmful to people or pets. The bad news is that they can be a real nuisance and eat the leaves of many trees and bushes.
Identification
These caterpillars are easy to spot.
They have yellow or pale green bodies. You can also see yellow stripes on their sides and dark stripes along their backs.
The nests are made of silk. The caterpillars use the webbing to shield themselves from predators and to survive the winter.
You’ll mostly see these nests on leaves at the ends of branches.
They’ll also munch on any tree they can find, except for conifers. But they seem to prefer the leaves of oak, ash, and hickory trees.
Adult fall webworm moths are primarily white, with hairy bodies. They also have dark spots on their wings.
How to Get Rid of Fall Webworms Naturally
These pests are not the pickiest eaters, but there are a few things you can do to keep them away or make your yard less appealing to them.
1. Parasitic Wasps
These wasps are natural enemies of webworms. They lay eggs inside the bodies of the pests. The eggs hatch and eat the caterpillars from the inside out.
Sounds pretty gross. However, it’s a natural way to eliminate these pests, and it’s highly effective.
You can attract predatory wasps by providing them with water and planting flowers and herbs to which they are attracted.
2. Birds
Another way to keep webworms out of pecan trees, fruit trees, and others is to attract birds to your yard.
Birds are natural predators of caterpillars, and they love to feast on webworms and their eggs. So put up a bird feeder or plant some trees and shrubs that will provide them with food and shelter.
You can also make your own DIY bird feeder. There are lots of different tutorials online, so you can choose the one that’s best for you.
And don’t forget to put out some fresh water for the birds to drink, too!
3. Spinosad
You may have seen these little critters in nests on your trees this fall. But before you reach for the toxic pesticides, consider using a natural product like spinosad.
Spinosad is derived from a natural soil bacterium. It effectively targets various pests, including fall webworms. This is a good brand.
4. Bacillus thuringiensis (Bt)
This is a good choice to control webworms if you have an infestation, and it is something you can do yourself.
Bacillus thuringiensis is available as a powder or liquid; you can buy it online at some garden stores. It kills the caterpillars by forming holes in their gut walls.
Once they eat the Bt, they will die within a few days.
5. Neem Oil
Another excellent natural treatment for webworms is neem oil. This is an all-natural product that is effective against many pests, including fall webworms.
You can buy a ready-to-use neem oil solution at most garden stores.
Or, you can make your own webworm spray. Just mix one tablespoon of cold-pressed neem oil with a gallon of water.
6. Poke Holes in the Nests
You can also kill webworms organically by poking holes in their nests. Doing this will expose them to predators, such as birds and wasps.
7. Soapy Water
Another excellent home remedy for webworms is a mixture of soap and water.
Fill a bucket with a mixture of dish soap and water. The ratio is two tablespoons of dish soap to a gallon of water.
Next, pull down the branch with the nest and submerge it in soapy water.
You can also put the soapy water into a spray bottle and spray the mixture onto the webs. The soapy water will kill the webworms.
8. Pruning
Pruning affected branches can help eliminate any fall webworms that may be present.
Once the branches fall to the ground, stomp on the nests to squish the caterpillars. Pruning will also encourage new growth and make your tree healthier overall.
9. Vegetable Oil
Furthermore, treat webworms in trees with vegetable oil.
All you need to do is pour some vegetable oil into a spray bottle and use it to saturate the nests. The critters inside will suffocate and die.
10. Debug Tres Insecticide
Debug Tres insecticide is a natural webworm killer. This product contains Azadirachtin and neem oil, and it is effective against a variety of pests.
All you need to do is mix it with the appropriate amount of water and spray it on the affected areas.
11. Horticultural Oil
Finally, you can use horticultural oil or dormant oil. This is a good brand, and it’s safe to use, even if the affected trees are close to your house.
It functions as an insecticide by suffocating the pests. It works on the larvae and eggs. But you must thoroughly saturate the pests and eggs for it to work.
Follow the instructions on the bottle.
See also: How to Get Rid of Sod Webworms in the Lawn.
Takeaway
So, you’ve discovered fall webworms in your garden and on small trees in your yard, and you’re not sure what to do.
The home remedies and natural products listed above can help eliminate or control the problem in one way or another.
Try out a few, or maybe all of them, to get rid of the critters for good.
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