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Weed Management with Roundup-Resistant Cotton

J.M. Robbie, J.W. Wilcut, A.C. York


Experiments were conducted at Clayton and Rocky Mount, NC to investigate weed control, crop response, and yield of Roundup Ready cotton (Gossypium hirsutum L.). Weed management systems consisted of the following herbicides combinations: Treflan applied preplant incorporated (PPI) at 0.5 lb ai/ac with Cotoran preemergence (PRE) at 1.25 lb ai/ac alone or followed by (fb) 1) Cotoran at 1.0 lb plus MSMA at 2.0 lb early post-direct (EPDS) alone or fb Bladex at 1 lb ai/ac plus MSMA art 2.0 lb ai/ac late post-direct (LPD), 2) Roundup early postemergence (EPOST) at 0.56 lb ae/ac alone or fb Bladex plus MSMA LPD, 3) Staple at 1.0 oz ai/ac EPOST alone or fb Bladex plus MSMA LPD. Other systems evaluated included Treflan PPI fb Staple EPOST alone or fb Bladex plus MSMA LPD, Cotoran PRE fb Roundup EPOST alone or fb Bladex plus MSMA LPD. Additional systems were Roundup applied EPOST alone or fb Bladex plus MSMA LPD, Cotoran PRE fb Roundup alone and fb Bladex plus MSMA LPD; and Treflan, Cotoran, and Treflan and Cotoran fb Roundup as needed. For Roundup as needed systems, Roundup was applied EPOST and then applied post-directed twice. There was an untreated check for comparison. All POST and Roundup treatments were applied using a nonionic surfactant at 0.25% and 0.50% (v/v), respectively. Weed species evaluated included prickly sida (Sida spinosa L.), Ipomoea spp., common lambsquarters (Chenopodium album L.), smooth crabgrass [Digitaria ischaemum (Schreber) Schreber ex Muhl.] at Clayton. Weeds evaluated at Rocky Mount consisted of large crabgrass [Digitaria sanguinalis (L.) Scopoli], prickly sida, pitted morningglory (Ipomoea lacunosa L.), common lambsquarters, and Pennsylvania smartweed (Polygonum pensylvanicm L.).

Reprinted from Proceedings of the 1996 Beltwide Cotton Conferences pp. 1528 - 1529
©National Cotton Council, Memphis TN

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Document last modified Sunday, Dec 6 1998