One of the first grower applications of a genetically transformed cotton was conducted at Bosco, LA. A cotton grower with a long history of problems with broadleaf weed infestations was selected by the authors. Transgenic seed, var. BXN, was supplied by Stoneville Pedigreed Seed Co. This seed was planted along with vars. St 453 and DPL 5415. Herbicide treatments included preemergence treatments of Prowl or Prowl plus Cotoran followed by two overtop applications of Buctril when applied to the BXN cotton, or a single overtop Staple application applied to the BXN or St 453 varieties, or a conventional postdirected treatment of Cotoran plus MSMA. All plots were cultivated twice with a Lilliston Rolling Cultivar. The test was conducted as a randomized complete block with three replications.

The Buctril applications provided excellent control of pitted morningglory, smooth pigweed and horse purslane, Staple provided excellent control of pitted moringglory and smooth pigweed, but poor control of horse purselane. The conventional postdirected treatment of Cotoran plus MSMA provided good control of morningglory, pigweed and fair control of horse purslane. All treatments following Cotoran as a preemergence application improved control of horse purslane. Yields of seedcotton and lint from all treatments were comparable.