Green Peach Aphid Control With Foliar Sprays, 1995

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. Four 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. Green peach aphids were mass reared on greenhouse sweet pepper plants (California Wonder) for release into individual plots. Aphid releases were made into test plots the last wk in Jun and again in the first wk of Jul. A total of four heavily infested pepper plants was released per plot. Treatment sprays were broadcast applied using a CO2 pressurized backpack sprayer (30 psi) and delivering 20 gal finished spray per acre (four, 10X hollow cone nozzles). Aphid counts were made from non-destructively examining 10 randomly selected leaves in the center two rows of each plot. Leaves were sampled from the top, middle, and bottom sections of the plants. The data collected and presented are the total number of aphids per 20 leaves. On 19 Jul a pre-count was taken and on 21 Jul all treatment applications were made. Data were analyzed using ANOVA and Student-Newman-Keuls multiple means comparison.