I grow fruit on my small hobby farm in Virginia and have an orchard of about 28 fruit trees, total. Peaches are usually our best performing fruit trees. This morning, I noticed tent caterpillars setting up shop on one of the branches of this peach tree.
Tent caterpillars are dangerous because once they emerge from the web-like tent, they can quickly defoliate (strip the leaves) off of your tree. Although it won't kill the tree outright, it will cause the tree great stress. It will put more energy into producing new leaves to survive rather than producing fruit. It's important to remove tent caterpillars as quickly as you spot them. I prefer using an organic method to do so, which I will teach you here.
This is a tent of tent caterpillars on my peach tree. The Eastern tent caterpillar (Malacosoma americanum) is the young of a nondescript brown moth. The female moth lays a batch of 200 to 300 eggs in late fall or early spring . When the young hatch, they spin the telltale tent. They feed three times a day, at day, noon and night, each time emerging from the tent to find leaves to eat. They expand the tent each day too so that as they grow, their tent grows. These young have just hatches. Adult caterpillars can be an inch long. These are only a few centimeters.
I prefer to use an organic method of removing tent caterpillars. Here is my equipment: a plastic zip lock bag, rubber gloves, and a rock. The feline helper is optional, although my cats, especially Groucho (shown here) love to help in the garden!
Put on the rubber gloves and open up the zip lock bag. I use zip closure bags because once the caterpillars and tents are removed, I zip them into the bag and place them in the trash so they can't get out again. If you just remove them from the tree and throw them on the ground, they will crawl right back up.
Here's why you need rubber gloves: use your fingers and brush the silken tent into the bag. You can use the rock to scrape the caterpillars off the bark, or use your fingers. Get them all and push them into the bag. Any that remain will simply start over again. When you're done, make sure they are all off of your rubber gloves and in the bag. Seal the bag and place it in the trash.