Question
What organic solution would you recommend for eastern tent caterpillars on my crapapple tree?

Answer
JoAnn,

I think the best option would be spinosad insecticide which is a new organically certified material. See http://www.livingwithbugs.com/spinosad.html for info and a label. Be sure to review the current label to make sure it is registered for your use, but I think it is.

Jack DeAngelis