we cut off all the infected area, web, and dead leaves, and branches where "worms" are and burn them, usually doing this, if all the "worms" are gotten, will stop the problem,and stop worms from coming back the next year, though if the tree is left uncleaned out, it will eventually die, and the worms could spread to other trees, and bushes.
burn em by: Anonymous
Here in Texas we get a similar webworm. We burn the web and the branch. A lighter usually suffices: we always have a hose already running nearby just in case. The web burns right off and the creepy crawlies inside fall to the ground, where we squish em. Recently there has been a chemical of some kind in the stores, but we don't like using pesticides of any kind. Fire and water: plain and simple.
These are mimosa webworms by: Moni
Mimosa webworms feed on honeylocust in the north, especially the yellower varieties of thornless honeylocust. Bad news is the adult moth is attracted to old webs, so webworms will continue to be a problem on this tree. Over time the tree is weakened and then other pests arrive to help to kill it off. Planting the greener varieties of honeylocust like 'Shademaster','Skyline', or 'Moraine' are less susceptible.
web worms by: Donalda
The best way we have found to handle these creatures without the use of pesticides is to nip the branch with the web and the brown leaves right off the tree.If the tree is too tall,use a water hose with lots of pressure to break the web apart so the birds and other predators can get at them. We had chickadees and goldfinches feeding off them in our flowering crab once the web was broken.