Infested pines are often attacked by other bark beetles. Eggs are laid in clusters and hatch in 10 to 14 days. Larvae feed side by side, excavating a large continuous area. There are two to four generations a year. Newly attacked trees can often be saved by spraying the base to the highest pitch tube on the trunk with an approved insecticide.
Preventive sprays are also effective for high value trees.
The prompt removal of infested trees also helps to control outbreaks. Adult excavating Photo by Ronald F. Billings Large pitch tube.