Janet from Lindrith Nm writes
To spray in holes in trees
We generally recommend using a pyrethroid such as Bifen IT or Permethrin SFR as a preventative treatment in late spring/summer before the egg hatches to protect trees. If trees are badly infested, then they should be removed and either chipped or burned.
Keep in mind that trees that become infested with bark beetles are almost always susceptible due to some other existing weakness such as drought or disease.
Answer last updated on: 12/14/2022
