Alfalfa Weevil and Pea Aphid Control in Alfalfa, 1997

Test plots were established near Kimberly, Idaho. The soil type was Portneuf silt loam and the field was irrigated by surface flow. Three treatments and an untreated check were replicated four times in a RCB design. Each individual test plot was 25 ft by 25 ft. Treatments were applied as a broadcast spray using a CO2 pressurized backpack sprayer using 30 psi and delivering 20 gpa (4, 10X hollow cone nozzles row). Sampling was accomplished by taking five, 90-degree 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 and all treatments were applied on 9 Jun. Additional counts were made at 7, 14, 21, and 30 d post treatment. Data were analyzed using ANOVA and Neuman-Keuls multiple means comparison (P = .05).