Organic Control of eastern tent caterpillars:
In early morning or in the evening when most caterpillars are in the nest, prune infested branches and burn or crush the nests or put them deeply inside a hot
compost pile.
Another way to remove tents filled with caterpillars from branches is by winding them onto a broomstick with nails projecting from it.
In winter, remove egg masses from bare branches; attract
native parasitic flies and wasps by growing small-flowered herbs, such as catnip, and wildflowers, such as Queen-Anne's lace.
Do not destroy wandering caterpillars with white eggs or cocoons attached to their backs; they are hosts for native parasites.
last resort:
Spray BTK weekly while larvae are small. (this is an organic
spray)