I have 2 apple trees in my backyards and would like to spray them organically (no chemicals) to control worms, can you recommend anything?
This is a pretty involved question so I think it best to send you the link to this very comprehensive page from Michigan State University. Michigan’s climate is the same as ours so the information given is appropriate here as well. http://web3.canr.msu.edu/vanburen/organasp.htm