I have a large pine tree that's in my yard, it is full of bag worms. I don't...

Asked July 25, 2013, 10:21 AM EDT

I have a large pine tree that's in my yard, it is full of bag worms. I don't want to have the tree cut down, will the wrms kill the tree and can I get rid of them so they don't?

Harford County Maryland

1 Response

If your bagworms are an inch or longer, they are less and less interested in eating and more inclined to pupate making them less susceptible to pesticides. Using Bt in June is very effective. Pick off any bagworms that you can reach. If you feel that you have to spray now, you could try spinosad, permethrin or pyrethrins. vw
https://extension.umd.edu/sites/default/files/_images/programs/hgic/Publications/HG32_Bagworms.pdf