blackberry bush infestation of worms/caterpillars

Asked August 18, 2018, 3:03 PM EDT

Do I destroy these infected branches? is this a bad bug or ok to leave alone. I really like this bush, it produces blackberries. Thanks

Montgomery County Maryland fruit fall webworm pest insects

1 Response

You are seeing fall webworm:
http://extension.umd.edu/hgic/fall-webworm-trees
It has a very wide host range including the Rubus genus that includes blackberry.

It is unsightly but causes little damage. They can be knocked out of the planting with a broom, by a hard water spray, or pruning them out and disposing of them in the trash. jt