Amanda from Corydon writes
When spraying the bark of a tree for borers how long can I expect this product to have it's intended effects? One week, two weeks, one month?
Astro Insecticide only has a residual of about 30 days on outside surfaces. It should only be used for prevention on healthy trees applied directly to the bark and branches up to 15 feet. Infected trees should be cut down (before the newly hatched beetles fly out of the trees in the spring/summer) and the wood burned or chipped, while other still healthy trees should be sprayed annually to protect them. Because of the natural boring behavior of the beetle they are protected from topically applied insecticides and systemic insecticides (those injected into the tree or applied as a root drench) have proven ineffective
Answer last updated on: 09/18/2019