Depends on the problem .I'm pretty sure none of the organics battle with fireblight. I use copper as a fungicide and it's very effective. I use Bonide fruit tree spray which is organic and it seems to be quite effective on bugs. Meerkat can attest to the persistence of Florida bugs I'm sure. So I keep Sevin, INDAR for the really big problems. BT for worms and cattapillers and Naturalyte for all my garden stuff. Seems to be at least mostly effective. I havent had any huge problems and the Naturalyte( Spinosad) seems to be pretty effective.