Weed Management and Crop Response with Glyphosate, S-Metolachlor, Trifloxysulfuron, Prometryn, and Msma in Glyphosate-Resistant Cotton

• DOI: 10.1614/wt-07-082.1
• Publication Date: 2008-03-12T19:07:03Z
• Authors: Scott B. Clewis; D.K. Miller; C.H. Koger; T.A. Baughman; A.J. Price; D. Porterfield; J.W. Wilcut
• Keywords: Metolachlor

Field studies were conducted in five states at six locations from 2002 through 2003 to evaluate weed control and cotton response early POST (EPOST), POST/POST-directed spray (PDS), late POST-directed (LAYBY) systems using glyphosate-trimethylsulfonium salt (TM), s-metolachlor, trifloxysulfuron, prometryn, MSMA. Early applications made mid May June; POST/PDS June July; LAYBY July August. season injury discoloration was minimal (< 1%) with all treatments; mid- late-season 2%) except for trifloxysulfuron (11 9%, respectively). Annual grasses evaluated included barnyardgrass, broadleaf signalgrass, goosegrass, large crabgrass. Broadleaf weeds entireleaf morningglory, pitted sicklepod, smooth pigweed. For the EPOST, POST/PDS, applications, cotyledon 10 leaf, 1 25 2 leaf stage, respectively. grass increased addition of s-metolachlor glyphosate-TM EPOST (85 98% control) compared alone (65 91% control), sicklepod where equivalent observed. greater plus PDS than or PDS, MSMA (90 94% vs. 75 83% control). With few exceptions, applied combination herbicide treatments (81 99% The a treatment by 11 36 percentage points without LAYBY. Cotton lint yield 420 kg/ha EPOST. 330 910 treatment. 440 LAYBY.Nomenclature: Glyphosate-TM, MSMA, Echinochloa crus-galli (L.) Beauv. ECHCG, Brachiaria platyphylla (Griseb.) Nash. BRAPP, Ipomoea hederacea var. integriuscula Gray. IPOHG, Eleusine indica Gaertn. ELEIN, arge crabgrass, Digitaria sanguinalis Scop. DIGSA, lacunosa L. IPOLA, Cassia obtusifolia CASOB, pigweed, Amaranthus hybridus AMACH, cotton, Gossypium hirsutum ‘DP 458 RR/BG’, 555 ‘FM 989 ‘PM 2344 ‘ST 4793 RR’