Efficacy of Temik, 1982

Abstract

Abstract Temik 15G applied at planting and post planting, was evaluated on a Hagerstown silt loam at the Southeastern Field Research Station at Landisville, Lancaster, Pa. A randomized complete block design with four replicates was used. Plots consisted of eight 20-ft rows planted 34 in apart. Certified Class B ‘Katahdin’ seed potatoes were planted 6 May, 1982, with a 9-in spacing between plants. Dithane M-45 was applied at 1.5 lb (AI)/acre on a 7-day schedule for potato late blight control. Three application techniques were evaluated: Temik applied once in-furrow at planting, as a split application in furrow followed by a side dress application on 25 Jun, and as a single layby application after plants had emerged on 16 Jun. Light cultivations preceeded and followed the layby and side dress applications. Forty stems were sampled each week for all stages of the Colorado potato beetle from 21 Jun until 19 Jul. A subjective damage estimate was also assessed. Two rows per plot were harvested 16 Sep, 1982 and graded by size. Rainfall totalled 8.36 inches in Jun, 2.74 inches in Jul, 1.10 inches in Aug and 3.17 inches in Sep. Average maximum and minimum temperatures (°F) were 78.2 and 56.7 for Jun, 86.0 and 62.3 for Jul, and 82.5 and 56.2 for Aug, and 77.1 and 51.7 for Sep.