Asked on Jul 6, 2013
I need help with two plant problems ...
#1) The aphids are back on my rudbeckias again this year. Or, at least I think they are aphids. Is there any way to prevent them from coming at all? They only hang on those plants but they are so thick ... ICK! Now that I have them, what works best to get rid of them? I live in Minnesota. #2) My lilies of the valley developed these ugly brown, almost rectangular, spots on the leaves soon after they bloomed. Happened to the neighbor's plants, too. They called the extension agent who told them to dig them out and dispose of them. I thought that sounded a little extreme. There should be some way to treat them. Any ideas? Thank you!