Ron from Ogden, Ut writes
Sevin Concentrate is best used to protect healthy trees from the listed borers on the label. Unfortunately there is no easy solution when it comes to pine borers. 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 for pine beetle infestations. Healthy trees can be protected before the beetles attack by topically spraying them with a synthetic pyrethroid like the Sevin. The tree should be sprayed from the ground to 15 ft up the trunk to prevent future infestations.
Answer last updated on: 05/21/2018