The time to act is before the leaves come out, around March. Put beneficial wasp eggs (get from any organic nursery) on a pin and stick it onto the tree trunk. Do this once a week for several weeks. they will hatch and take care of the tent caterpillars before you can really see them. If you can reach any of the "bags", cut them down and tear them open. You may be surprised to see hungry wasp go for them immediately. If not, spray them with orange oil for a quick death.
_________________ Sandi Texas Certified Nursery Professional Texas Master Naturalist Organic gardener Tree-Hugger Native Texan
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