Field studies conducted at three locations in North Carolina in 1998 and 1999 evaluated crop tolerance, weed control, and yield with CGA-362622 alone and in combination with various weed management systems in transgenic and nontransgenic cotton systems. The herbicide systems used bromoxynil, CGA-362622, glyphosate, and pyrithiobac applied alone early postemergence (EPOST) or mixtures of CGA-362622 plus bromoxynil, glyphosate, or pyrithiobac applied EPOST. Trifluralin preplant incorporated followed by (fb) fluometuron preemergence (PRE) alone or fb a late POST–directed (LAYBY) treatment of prometryn plus MSMA controlled all the weed species present less than 90%. Herbicide systems that included soil-applied and LAYBY herbicides plus glyphosate EPOST or mixtures of CGA-362622 EPOST plus bromoxynil, glyphosate, or pyrithiobac controlled broadleaf signalgrass, entireleaf morningglory, large crabgrass, Palmer amaranth, prickly sida, sicklepod, and smooth pigweed at least 90%. Only cotton treated with these herbicide systems yielded equivalent to the weed-free check for each cultivar. Bromoxynil systems did not control Palmer amaranth and sicklepod, pyrithiobac systems did not control sicklepod, and CGA-362622 systems did not control prickly sida.
Nomenclature: Bromoxynil; CGA-362622, N-[(4,6-dimethoxy-2-pyrimidinyl) carbamoyl]-3-(2,2,2-trifluoroethoxy)-pyridin-2-sulfonamide sodium salt; fluometuron; glyphosate; MSMA; prometryn; pyrithiobac; trifluralin; broadleaf signalgrass, Brachiaria platyphylla (Griseb.) Nash BRAPP; entireleaf morningglory, Ipomoea hederacea var. integriuscula Gray IPOHG; large crabgrass, Digitaria sanguinalis (L.) Scop. DIGSA; Palmer amaranth, Amaranthus palmeri S. Wats. AMAPA; prickly sida, Sida spinosa L. SIDSP; sicklepod, Senna obtusifolia (L.) Irwin and Barneby CASOB; smooth pigweed, Amaranthus hybridus L. AMACH; cotton, Gossypium hirsutum L. ‘Paymaster 1220 RR’, ‘Stoneville BXN 47’, ‘Stoneville 474’.