Fall webworm pictures to help you quickly identify this quarantine pest

The fall webworm is a worldwide quarantine pest native to North America. The adult is a moth that is pure white all over, and many pictures show exactly how it looks at rest with its wings spread. It mainly damages forest trees and fruit trees and is listed as a quarantine target by many countries and regions, so accurately recognizing it through pictures is very necessary.

To identify the fall webworm from pictures, you can focus on several typical features. The adult's wings are mainly white, and some individuals have light brown spots on the forewings; the body is not especially large. The larva's body color changes with each instar, with common black-type and red-headed-type forms, and the body surface is covered with hair tubercles and long hairs. Mature larvae mostly pupate in hidden places such as cracks in tree bark, and the pupa is often wrapped in a sparse silk cocoon.

The damage caused by the fall webworm is also easy to recognize in pictures. Young larvae have a gregarious habit, spinning silk to weave webs that enclose leaves for feeding, so branches hang with sheet after sheet of white webbing that looks like small tents from a distance. Leaves inside the webs are often chewed until only veins remain, and in severe cases all the leaves on a tree are eaten, affecting tree growth and even causing death. Its feeding habits are very broad, and fruit trees, street trees and ornamental trees can all be harmed.

For control, emphasis is placed on early detection and early treatment. During the larval web stage the target is obvious, and manually cutting off the webs and disposing of them properly is a common method; it can also be combined with light traps to kill adults, protection and use of natural enemies, and scientific pesticide application to control the population. If fruit growers or members of the public find a suspected fall webworm, they can take photos to record the location and promptly report it to the local forestry or agriculture department to prevent its spread and expansion.