Potato Insect Control, 1994

Abstract

Abstract Potatoes were planted on 30 Apr in South Deerfield, Massachusetts. Fertilizer (600 lbs 10N:10P:10K/acre) was banded into the furrow at planting, and an additional 200 lbs was applied at hilling on 30 Jun. Soil type was a fine sandy loam with a pH of 5.6. Manzate (fungicide) was applied at 1 lb. Al/acre on 30 Jun and 25 Jul. Treatments were replicated 4 times in a randomized complete block design. Each plot consisted of two 30 ft. rows with a 6 ft. fallow area separating each plot. All samples were taken from the center two rows. Treatments were applied with CO2-pressurized sprayers at 40 psi, delivering about 70 gal/acre. CPB population densities were determined by counting larvae on 5 whole plants or stalks in each plot. The number of early instars (first and second) or late instars (third and fourth) were recorded. Admire was applied to the base of plants on 8 Jun; plants were about 8” tall. The foliar treatments were first applied on 15 Jun, and then again on 22, 29 Jun, 6, 13, 20 and 27 Jul. The first two abamectin treatments were treated with Novodor at 2.5 qt/acre on 15 and 22 Jun followed by a single application of abamectin on 29 Jun, while the last two abamectin treatments were treated with Novodor at 2.5 qt/acre weekly from 15 Jun through 13 Jul and then on 20 Jul received a single application of abamectin. Fipronil treatments were applied on 15, 29 Jun, 13 and 27 Jul.