Butterfly Weed & Aphids!
For the second year in a row, our Mexican Butterfly Weed (asclepias curassavica) has become infested with tiny orange aphids -- absolutely infested -- on the underside of the leaves! Nowhere else in the yard do we ever see them. They are doing great, are 3 feet high now, and get full sun from first dawn till about 2pm.
I spray with organic controls but they still keep coming. I'm now starting to see some lower leaves yellow st the ends they are piled on so thick.
Could all the rain this year and lack of sun have stressed the plant, so they are being taken advantage of now? Any other ideas how to stop them??