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Influence of Adjuvants on Cotton (Gossypium hirsutum) Response to Postemergence Applications of CGA 362622

Published online by Cambridge University Press:  20 January 2017

Robert J. Richardson ,
Henry P. Wilson ,
Gregory R. Armel  and
Thomas E. Hines
Robert J. Richardson
Affiliation:
Eastern Shore Agricultural Research and Extension Center, Virginia Tech, Painter, VA 23420
Henry P. Wilson*
Affiliation:
Eastern Shore Agricultural Research and Extension Center, Virginia Tech, Painter, VA 23420
Gregory R. Armel
Affiliation:
Eastern Shore Agricultural Research and Extension Center, Virginia Tech, Painter, VA 23420
Thomas E. Hines
Affiliation:
Eastern Shore Agricultural Research and Extension Center, Virginia Tech, Painter, VA 23420
*
Corresponding author's E-mail: [email protected]
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Abstract

Studies were conducted in 1999, 2000, and 2001 to evaluate cotton response to CGA 362622 applied postemergence with various adjuvants. In field studies, CGA 362622 was applied at 3.8 or 7.5 g ai/ha with nonionic surfactant, crop-oil concentrate (COC), or a urea-based adjuvant. A nontreated control was maintained weed free for comparison. Crop injury over all years at 1 wk after treatment (WAT) was 27 and 34% from 3.8 and 7.5 g/ha CGA 362622, respectively, when rates were pooled over adjuvants. At 4 WAT, injury was 6 to 14% with 3.8 g/ha and 10 to 21% with 7.5 g/ha CGA 362622 during the 3-yr study. Cotton heights at 2 WAT were reduced by 16 to 31% of nontreated cotton heights by CGA 362622. Heights of treated cotton did not differ and were generally equivalent to the nontreated control at 8 WAT. Cotton injury and height reduction were greatest when CGA 362622 was applied with COC. Cotton lint yields and fiber quality were not affected by CGA 362622 rate or adjuvant treatment. Cotton injury from CGA 362622 in the greenhouse was similar to that in the field. Initial cotton injury and subsequent reduction in leaf area or shoot dry weight were generally lowest when CGA 362622 was applied with no adjuvant or UBA in the greenhouse.

Keywords

CGA 362622 (proposed common name trifloxysulfuron sodium), N-[(4,6-dimethoxy-2-pyrimidinyl)carbamoyl]-3-(2,2,2-trifluoroethoxy)-pyridin-2-sulfonamide sodium saltcotton, Gossypium hirsutum L. ‘SureGrow 125.’Sulfonylurea herbicideALS, acetolactate synthase enzyme (EC 4.1.3.18)COC, crop oil concentrateMSO, methylated seed oilNA, no adjuvantNIS, nonionic surfactantOSS, organosilicone surfactantPOST, postemergenceUBA, urea-based adjuvantWAT, weeks after treatment
Type
Research
Information
Weed Technology , Volume 18 , Issue 1 , March 2004 , pp. 9 - 15
Copyright
Copyright © Weed Science Society of America 

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