Pine saw flies, broad-waisted wasps that resemble houseflies, can cause serious defoliation in pine stands. Several species are found in the state and all can produce several generations yearly. The young larvae feed on needles; the timing of the destruction and the needles feasted upon vary with each species of saw fly. When infestations reach unacceptable levels, insecticide soaps and sprays may need to be applied.
For further information about pine sawflies, visit
the following link:
www.entomology.umn.edu/cues/Web/155IntroducedPineSawfly.pdf |