Asked June 06, 2021, 5:57 PM EDT
Hi, I have a 25' tall tri-color beech tree that has become infested by what I think are beech blight aphids. They are small and white, and seem to be on the underside of the leaves and form a sticky substance.
I have already tried spraying the tree with a pyrethrin solution as well as a mix of diluted castille soap/vegetable oil. It is a bit tricky to do since this is such a large tree. I have been using a hose-end sprayer.
Does my assessment sound correct to you, and is there anything else I should be doing to help control the aphids?
also, is there any preventative treatment I can do in the early spring before the leaves come out to prevent the same thing happening again next year?
thanks for any advice!
Ingham County Michigan