Hardiness Zone: 6a
Nancy from Margate, NJ
The can easily dislodge the caterpillar tent from the tree. Blast it off with a garden hose or use a broom to knock it down. Once the nest falls to the ground how you dispose of it is up to you. The caterpillars will have a hard time returning to the tree and are more likely to succumb to the voracious appetites of nearby birds then make it back to safety. The best time to destroy the tent is right around dawn or dusk. These are the times the caterpillars return to the tents after they finish feeding. If you prefer not to knock it down, you can also use an organic control called Bacillus thuringiensis (Bt). This can be expensive and difficult to apply and is probably only economical for multiple nests in multiple trees.
To further protect your tree from migrating caterpillars, construct a barrier band around the trunk made of duct tape, tin foil or tar paper and coat it generously with a greasy substance like Vaseline. Don't apply the grease directly to the tree bark. The band should be in the shade or you may risk killing the bark and cambium that is underneath. Check the barrier daily and add more grease if necessary. Remove it as soon as the caterpillar cycle appears over (you see individual cocoons being formed in other people's trees).
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By jgl7777 (Guest Post) 05/11/2006 Flag
That sounds like bag worm.
The best and easiest way is to simply put a match,candle up to it and set it on fire. it sounds crazy bur it works and doesn't hurt the tree!! The "bag" catches on fire and then goes out as soon as the "bag" is gone. You can have a hose nearby if you want to be extra careful.
By Karen (Guest Post) 05/12/2006 Flag
It sounds like web worm. Just take a broom or something and pull it out of the tree. The tree should be fine. That is what they taught us at Clemson. Good Luck...