Fall Webworm

By The Old House Web

Fall Webworm

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The nest of fall webworm are a common part of the landscape in late summer.

Eggs are laid in the spring and the larvae hatch out and go through a number of stages of development. The larvae change color but always have black spots and are hairy. The insects feed inside a web that can become fairly large by summer's end.

It is the objectionable appearance of the nest that causes concern. The insects rarely cause serious harm to the host.

Small nests can be pruned out of the tree when noticed. The nests are often burned out but the burning can be more harmful to the tree than the insect injury.

Controls include Bacillus thuringiensis or Orthene.

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