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Interaction of Graminicides Applied in Combination with Pyrithiobac

Published online by Cambridge University Press:  12 June 2017

Charles E. Snipes  and
Ralph L. Allen
Charles E. Snipes
Affiliation:
Mississippi Agric. For. Exp. Stn., Delta Branch, Stoneville, MS 38776
Ralph L. Allen
Affiliation:
Mississippi Agric. For. Exp. Stn., Delta Branch, Stoneville, MS 38776
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Abstract

Field experiments were conducted from 1992 through 1994 to determine the effect of selected graminicides when applied in combination with pyrithiobac for johnsongrass control in cotton. Quizalofop-P, clethodim, sethoxydim, and fluazifop-P were applied at rates recommended for rhizome johnsongrass control with or without pyrithiobac at 70 g ae/ha. At 14 DAT johnsongrass control without pyrithiobac was more than 85% for all graminicides all years except sethoxydim in 1993. When graminicides were applied in combination with pyrithiobac, johnsongrass control was 86% or less and was lower than when each respective graminicide was applied alone. At 21 DAT, similar differences were apparent. Seed cotton yield, determined only one year, was not affected by reductions in johnsongrass control when either quizalofop or clethodim were used in combination with pyrithiobac. Pyrithiobac applied alone controlled johnsongrass 20 to 44% 14 DAT depending on year.

Keywords

Clethodim, (E,E)-(±)-2-[1-[[3-chloro-2-propenyl)oxy]imino]propy]-5-[2-(ethylthio)propyl]-3-hydroxy-2-cyclohexen-1-onefluazifop-P, (R)-2-[4-[[5-trifluoromethyl)-2-pyridinyl]oxy]phenoxy]propanoic acidpyrithiobac, 2-chloro-6-[(4,6-dimethoxy-2-pyrimidinyl)thio]benzoic acidquizalofop-P, (R)-2-[4[(6-chloro-2-quinoxalinyl)oxy]phenoxy]propanoic acidsethoxydim, 2-[1-(ethoxyimino)butyl]-5-[2-(ethylthio)-propyl]-3-hydroxy-2-cyclohexen-1-onejohnsongrass, Sorghum halepense (L.) Pers. # SORHAcotton, Gossypium hirsutum L. ‘DES 119.’Antagonismsynergismtank-mixSorghum halepenseSORHA
Type
Research
Information
Weed Technology , Volume 10 , Issue 4 , December 1996 , pp. 889 - 892
Copyright
Copyright © 1996 by the Weed Science Society of America 

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