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Experimental plots were established on the UI Research and Extension Center, Kimberly, Idaho. Potatoes were planted on 28 Apr and irrigated by solid set sprinkler. The soil type was Portneuf silt loam. Ten treatments and one untreated check plot were replicated four times in a RCB design. Individual 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 in the greenhouse on mustard plants (Brassica juncea L. ‘Florida Broadleaf’) for release into individual plots. Aphid releases were made into test plots on 14 Jun. A total of four heavily infested leaves were released per plot. On a weekly basis, adults, large larvae (3-4 instar), small larvae (1-2 instar), and egg masses of Colorado potato beetle were counted and percent defoliation estimates were made from whole plant inspections of the center 5 hills of the middle 2 plot rows. Green peach aphid counts were made by non-destructively sampling 20 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 is the total no. of aphids/20 leaves. Admire treatments were applied at planting as an in-furrow S over the seed piece on 28 Apr. Temik and Thimet were applied in-furrow with the seed piece at-planting. Post-emergence Admire was side dressed and shanked on 29 May. Furadan and the at-emergence, pre-hilling Admire treatment were applied on 6 Jun. Furadan was applied in a six-inch banded S over the plants at 4-inch rosette stage of plant growth using a CO2-pressurized backpack sprayer. The at-emergence, pre-hilling Admire treatment was shanked to the side of the plants (3 inch to side and 4 inch deep) and then hilled. On 26 Jun the CGA-215944 and Sevin treatments were S applied. All foliar S treatments were broadcast applied using the backpack CO2 sprayer at a rate of 20 gpa (30 psi, with 4, 10X hollow-cone nozzles). On 28 Jul a second foliar application of Furadan was made. Data were analyzed using ANOVA and Tukey’s HSD Test.

Colorado Potato Beetle and Green Peach Aphid Control with Soil-Applied Insecticides and Foliar Sprays, 1997