Try Azatrol or any product with Azadirachtin in it. Azatrol is an certified organic and is OMRI listed. Starves the bugs and prevents the from procreating. Works well. See link below

AzatrolĀ® Product Page
skyhigh35 Reviewed by skyhigh35 on . weed trees getting eatin please help i have 8 plants 1 kinda large 3 medium rest are babies and all are getting eaten. i grow outside it normal pro-mix in a pot. my trees are surrounded by bushes and i know that's were they bugs are coming from. I'm sorry but i only have 2 pics of my biggest plant. any help much appreciated. Rating: 5