Colorado Potato Beetle Control on Potatoes with In-Furrow Treatments, 1994
Abstract ‘Kennebec’ potatoes were planted in 20 foot rows on 25 Apr, ‘94. Plots consisted of a single treatment row. The distance between rows was 64 inches and the distance between plants within the row was 10 inches. Plots were arranged in a randomized complete block design with 4 replications. The soil was a Norfolk "A" loamy sand. Initial furrow treatments were applied to the seed at the rate of 20 gal per acre with a small watering can. Admire foliar treatments were applied at a rate of 50 gal per acre on 8, 23 and 29 Jun with a custom built compressed air row crop sprayer with each row being covered by 6 drop nozzles delivering 50 gal/acre at 30 psi. In evaluating the treatments, direct counts of the number of Colorado potato beetle adults, larvae and egg masses/10 plants and the % defoliation were recorded. Defoliation categories were assigned using a pretransformed defoliation rating scale, based on dividing 90° into 13 steps corresponding to arcsin transformation values (Little & Hills 1978). Yields were taken on 20 Jul from 20-ft of row.