Evaluation of Insecticides to Control Scale on Timothy in Washington, 1977

Abstract

Abstract Eight insecticides were evaluated at Badger Basin in Kittitas County on timothy-alfalfa. Insecticides were applied to 8 x 25 ft plots in a randomized complete block design with untreated checks in 3 replications. Sprays were applied on June 7 with a compressed air plot sprayer mounted on a bicycle-wheeled carriage, using 40 psi pressure and applying 32.5 gal/acre. Timothy height was 2 to 3 ft. The plots were evaluated on June 29 by rating the abundance of scale/ft2 in each plot using a scale of 1 to 6 [1= no crawler or mature scale; 2=no crawlers, a few mature scale (<10); 3=occasional crawler (1 to 2), 10 to 20 mature scale; 4= 2 to 10 crawlers, 10 to 20 mature scale; 5=11 to 50 crawlers, 20 to 50 mature scale; 6=>50 crawlers, > 50 mature scale].