Hi -you are right about the weather and black spot, the humidity plays a big part. Cleaning up infected debris from last year and growing resistant varieties are the best methods of any fungal control. The old types are usually more resistant. If you really think that the spots are a problem (that old threshold concept), try using a copper fungicide at about 1/5 the recommended strength. You will need to spray nearly all summer, and make sure you totally dispose of all infected debris. Another fungicide that should not do too much damage to your insects is a mix of baking soda and hort oil in water. Found a good recipe at this link (http://www.texasgrown.com/pages/inthegarden.htm). It is a commercial link, but it looked pretty straight forward. Can't gaurantee these won't kill your benes, but you really have to pick your battles in the garden. Good luck,
Lisa in Mpls.
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