I believe they are tent caterpillars!!! Get them out of the tree, they eat every last leaf on the poor thing!!!! I hate them!! and that's a strong word for me to use!!! HATE THEM!!!! anywho.....the ones that are up, out of reach i wrap an old rag around the end of a pole, I know most of you will be upset by this, but I am very careful when I do it, put a few drops of lighter fluid or something to have a small flame and burn the "tent" out of the higher branches. You don't burn the tree, just get it close to the web and it melts away and the caterpillars drop down and you stomp away!!! They really are devastating to the foliage esp. on a young tree. Anywho... get them out! Yuck! Good luck!

Thanks Phil & Laura~ & Renee for your help! I have searched thru the trees & cant find any tents or bags, only see lots of brown fuzzy stuff scattered here & there over the trees. the wind blows it down on to the yard. the worms are hanging down from all around the trees! anyway thanks bunches!!!!

AAAAhhhh !!! thank you bug lady, so much! i m thinking the same that its inch worms.was racking my brain, or whats left of it trying to figure out how to spay big trees Keep up the good work!!

Big article in paper today. The green worms are canker worms. To late to spray. They will be gone in 2 weeks. Thank Goodness. I am tired of picking them out of my hair!!