Colorado Potato Beetle Control with Foliar Sprays, 1991

Abstract

Abstract Experimental plots were established in a potato field on the UI Research and Extension Center, Caldwell, ID. The soil type was Portneuf silt loam and irrigation was by furrow. Thirteen treatments and two untreated check plots were replicated four times in a randomized complete block design. Individual treatment plots were 4 rows (36 inch row spacing) wide by 25 ft long. Applications were made as a broadcast spray using a CO2 pressurized backpack sprayer. Twenty gal of finished spray were applied [using 30 psi and X-8 (Spraying Systems) hollow cone nozzles] to all plots except for Kryocide which was sprayed using 50 gal/acre. Pre-treatment counts were made and the first insecticide treatments were applied 25 Jun. A second application of MYX 1806, Foil, Kryocide and ground root of Chinese Bittersweet (CB) was made on 2 Jul. All beetle stages were counted and percent defoliation observations were made weekly using whole plant inspections of the center five hills of the center two plot rows. Larval stages were separated into small (1-3 instar) and large (4-5 instar). Data were analyzed using ANOVA and Newman-Keuls studentized range test