I'm starting to get a lot of calls about wooly oak aphids. It kind of looks like dryer lint in a tree. What is your favorite response on controlling this pest?
- William A.
I have not gotten any emails on this, so thanks for sending it. Control is not critical. They are well tolerated by the trees and there should be no lasting harm. People could just let them run their course and go away on their own.
A smaller tree could be sprayed with a forceful jet of water to remove the aphids and cottony material. Or, a light horticultural oil could be sprayed over the tree thoroughly coating the underside of the leaves.
A systemic neonicotinoid like imidacloprid or dinotefuran applied as a drench at the base will also eventually control these insects.
Consumer Horticulture Specialist
The LSU AgCenter and the LSU College of Agriculture