Tent caterpillars form a silken tent or nest in trees. They hatch in the spring and emerge to feed on the nearby leaves. In our area, the Western tent caterpillar is most often seen infesting trees in May and early June.
Luckily, tent caterpillars are fairly easy to treat. Proscape recommends cutting out by hand any visible nests. There are also insect sprays that can be used to treat the problem. Contact us for assistance with diagnosis and treatment of your trees.