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1 January 2000 Influence of Cultivation Timing on Pyrithiobac Performance in Cotton (Gossypium hirsutum)
ERIC P. WEBSTER, DAVID R. SHAW, TODD A. BAUGHMAN, CHARLES E. SNIPES, CHARLES T. BRYSON
Author Affiliations +
Abstract

Abstract: Pitted morningglory control with norflurazon or fluometuron preemergence (PRE), each at 1.12 kg/ha, was 72% or less 14 d after a postemergence (POST) application of pyrithiobac in 1993 and 1994. Pyrithiobac POST at 70 g/ha following fluometuron or norflurazon PRE cultivated at any timing controlled pitted morningglory at least 76%. Pyrithiobac POST controlled common cocklebur equal to the weed-free in 1993 at 14 d after the POST application. In 1994, when rated 28 d after pyrithiobac POST, cultivation 3 d before a single application of pyrithiobac controlled less common cocklebur than any other herbicide treatment containing pyrithiobac. At 28 d after pyrithiobac POST, no treatment controlled common cocklebur as well as the weed-free. In 1993 and 1994, seed cotton yield was equal to the weed-free when pyrithiobac followed fluometuron PRE cultivated at any timing or a single application of pyrithiobac cultivated prior to 7 d after POST application.

Nomenclature: Fluometuron, N,N′-dimethyl-N′-[3-(trifluoromethyl)phenyl]urea; norflurazon, 4-chloro-5-(methylamino)-2-(3-(trifluoromethyl)phenyl)-3(2H)-pyridazinone; pyrithiobac, 2-chloro-6-[(4,6-dimethoxy-2-pyrimidinyl)thio] benzoic acid, sodium salt; common cocklebur, Xanthium strumarium L. #3 XANST; pitted morningglory, Ipomoea lacunosa L. # IPOLA; cotton, Gossypium hirsutum L. ‘DES-119’.

Additional index words: Fluometuron, norflurazon, Ipomoea lacunosa, Xanthium strumarium, IPOLA, XANST.

Abbreviations: ALS, acetolactate synthase (EC 4.1.3.18); DAPA, days after POST application; DBPA, days before POST application; DREC, Delta Research and Extension Center; fb, followed by; IAPA, immediately after POST application; POST, postemergence; PRE, preemergence; PSRC, Plant Science Research Center; SWSRU, Southern Weed Science Research Unit Farm.

ERIC P. WEBSTER, DAVID R. SHAW, TODD A. BAUGHMAN, CHARLES E. SNIPES, and CHARLES T. BRYSON "Influence of Cultivation Timing on Pyrithiobac Performance in Cotton (Gossypium hirsutum)," Weed Technology 14(1), 116-121, (1 January 2000). https://doi.org/10.1614/0890-037X(2000)014[0116:IOCTOP]2.0.CO;2
Published: 1 January 2000
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