Another orchardist I know is using 'Neem' cake (this is the residual left over after pressing out neem oil) as a systemic for borer on her peach trees. Much as I hope this works, I am a little fearful of unforseen consequences of using a systemic anything around bee polulations...
I found this site that may be of use to you Coppice. http://www.discoverneem.com/neem-bees-beneficial-insects.html I would presume that if neem oil doesn't affect bees then neem cake won't either.
Thanks Eileen. I thought I would try Neem oil this year on my iris. They are attacked by iris borer every year.
