Alfalfa Weevil and Aphid Control in Alfalfa, 1994

Test plots were established at the UI Research and Extension Center, Kimberly, ID. The soil type was Portneuf silt loam and the field was irrigated by surface flow. Eleven treatments and an untreated check were replicated 4 times in a RCBD. Each individual test plot was 20 ft × 25 ft. Sprays were applied as a broadcast spray using a CO2 pressurized backpack sprayer using 30 psi and delivering 20 gpa (four, lOx hollow cone nozzles). Sampling was accomplished by taking five, 90° pendulum sweeps (15 inch diam sweep net) per plot. Counts were made of all alfalfa pest species present as well as all beneficial insects. A pre-treatment count was made on 23 May and all treatments were applied on 25 May. Counts were made at 24 h, 7 and 14 DAT. Data were analyzed using ANOVA and Tukey’s multiple means comparison.