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Weed Management in Strip Tillage Roundup Ready (Glyphosate-Tolerant) Cotton

S. B. Clewis, J. W. Wilcut, S. D. Askew and J. D. Hinton


 
ABSTRACT

Studies were conducted in Goldsboro, NC in 1998 and 1999 and Lewiston, NC in 1999 to evaluate weed management programs in strip-tilled ‘Paymaster 1220RR/BG' cotton (Gossypium hirsutum). Cotton was planted in 38-inch rows on sandy loam soil. The wheat cover crop was terminated with a Roundup Ultra (glyphosate) (1.0 qt/A) treatment approximately 30 days prior to planting. Twelve herbicide systems were evaluated which included a factorial arrangement of preemergence (PRE) systems and postemergence (POST) systems. Preemergence herbicide options included 1) nothing, 2) Prowl (pendimethalin) (39 fl oz/A PRE) plus Cotoran (fluometuron) (1 qt/A PRE) broadcast, 3) Prowl (39 fl oz/A PRE) banded (19-inch band), or 4) Prowl (39 fl oz/A PRE) plus Cotoran (1 qt/A PRE) banded. Postemergence herbicide options included 1) nothing, 2) Roundup Ultra as needed (1.5 pt/A ASN) alone, or 3) Roundup Ultra (1.5 pt/A ASN) followed by (fb) Caparol (prometryn) (1.2 qt/A) plus MSMA (2.67 pt/A) late post directed (LAYBY). Roundup Ultra was applied to four leaf cotton or smaller, after the 4L growth stage Roundup Ultra was applied post-directed to minimize Roundup Ultra contact with the cotton foliage. Soil-applied herbicides were applied on a band in the PRE systems in a 19-inch band on the drill.



Reprinted from Proceedings of the 2000 Beltwide Cotton Conferences pg. 1476
©National Cotton Council, Memphis TN

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Document last modified Saturday, Jun 17 2000