Wooly adelgid treatments

Asked April 16, 2016, 2:20 PM EDT

I have two large hemlocks that are showing signs of egg sacks. I read that you can treat this at the trunk for large trees. Any suggestions on products and method?

Luzerne County Pennsylvania trees and shrubs master gardener program pest management pest control hemlock woolly adelgid horticulture

1 Response

The DCNR in my district is recommending Safari, a systemic pesticide that has to be applied by a licensed tree service. It will last a year or two. For a one time result, the service can spray sevin or horticultural oil.
There is a federally approved biological control in the form of a Japanese lady beetle S. tsugae that is being sold at tree-savers.com out of Scranton. You can check that out.
It's important to teat the tree before it gets too desiccated by HWA.