In-Furrow Systemic Insecticide-Nematicide Test, 1987

Abstract

Abstract Counter, Furadan, Lance, Temik, and Di-Syston were compared as infurrow systemics in a test at the Northeast Research Station, St. Joseph, La. Terraclor Super-X (TSX) was applied with all in-furrow systemics as a standard fungicide. Orthene 80S seed treatments, 6.4 oz (AI)/acre, were used as controls. Test plots were replicated 4 times in a randomized complete block design, and were 4 rows (40-inch spacing) × 65 ft. Cotton was planted on 14 May on a commerce silt loam soil, which was fertilized with 60 lb/acre of nitrogen. Test treatments were applied in furrow with a John Deere 7100 planter equipped with granular applicator split boxes. Major pest or secondary pest treatments were initiated in June and maintained on an as-needed treatment basis through August. Treatment efficacy for thrips and cotton aphids was measured by washing insects from 10 seedling cotton plants/plot onto 300-mesh screens, backwashing them onto lined filter paper (7 cm), and counting them with the aid of a binocular dissecting microscope. Collections and observations on these pests were made 3, 9, and 24 Jun. Data on populations are reported as the mean number/25 plants sampled across dates. Stand and skip data were recorded by counting all plants and skips 18 inches or greater on the center 2 rows. Yields were estimated by harvesting the 2 center rows of each plot with a mechanical harvester on 10 and 23 Oct.