Green Peach Aphid Control with Foliar Sprays, 1996

Abstract

Abstract Experimental plots were established on the UI Research and Extension Center, Kimberly, Idaho. Potatoes were planted on 25 Apr and irrigated by solid set sprinkler. The soil type was Portneuf silt loam. Six treatments and one untreated check plot were replicated four times in a RCB design. Individual treatment plots were 4 rows (36 inch row spacing) wide by 25 ft long with 5-ft alleyways separating the plots. GPA was mass reared on greenhouse sweet pepper plants (‘California Wonder’) for release into individual plots. Aphid releases were made into test plots on 27 Jun and again on 8 Jul. A total of four heavily infested plants were released per plot. Treatment sprays were broadcast applied using a CO2 pressurized backpack sprayer (30 psi) and delivering 20 gpa finished S (four, 10X hollow cone nozzles). Aphid counts were made from non-destructively sampled leaves at random from the top, middle and bottom sections of plants in the center two rows of each plot. The data collected and presented are the total no. of aphids per 20 leaves. On 5 Jul, pre-treatment count was taken at which time it was determined that aphid populations were too low to treat. On 10 Jul, a second pre-treatment count was made and all treatments were applied 11 Jul. All plots received applications of Carbaryl as needed to control Colorado potato beetle. Data were analyzed using ANOVA and Newman-Keuls multiple means comparison (P = .05).