Insecticidal Drenches Evaluated for Control of Otiorhynchus Spp. Larvae in Transplant Beds, Pennsylvania, 1977

Alberta spruce transplants (2-2) growing in beds 4 ft wide by ca 40 ft long on a well-drained (loam and grovel) hilltop near Indiana, Pennsylvania were divided into 5 x 5 ft sections with pot stakes and string. A 2 ft buffer zone was left between the 25 sq ft sections. Treatments were randomly assigned to sections within each of 3 blocks. The appropriate amount of insecticide was applied with a sprinkling can in 1.5 gal water/25 sq ft section on May 6. This was followed immediately with another 1.5 gal water in the same manner. The soil was moist but not saturated when treatments were applied. Treatment effectiveness was evaluated May 26-27 by inspecting each of 2 cubic ft soil samples from each section for living larvae and pupae.