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Cotton (Gossypium hirsutum) Injury from Simulated Quinclorac Drift

Published online by Cambridge University Press:  12 June 2017

Charles E. Snipes ,
Joe E. Street  and
Thomas C. Mueller
Charles E. Snipes
Affiliation:
Delta Branch Exp. Stn., Stoneville, MS, 38776
Joe E. Street
Affiliation:
Delta Branch Exp. Stn., Stoneville, MS, 38776
Thomas C. Mueller
Affiliation:
Univ. Tennessee, Knoxville, TN, 37901
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Abstract

Cotton (Gossypium hirsutum) response was evaluated when quinclorac was applied prior to cotton emergence (preemergence) and to cotton in the cotyledon and pin-head square stages in 1988, 1989, and 1990. Quinclorac applications at 9, 17, 35, 70, and 140 g ha−1 prior to cotton emergence had little effect on cotton growth, with only 140 g ha−1 causing stand reduction or stunting. Quinclorac application to cotton in the cotyledon stage caused more damage, and 70 g ha−1 caused crop injury. Greatest phytotoxicity was observed when quinclorac was applied to cotton at pin-head square, with all rates including 9 g ha−1 causing injury. Cotton injury consisted of leaf strapping and malformation of reproductive structures. Regression analysis revealed yield was reduced by quinclorac applications to cotton in the cotyledon or pin-head square stage. The approximate regression equation to predict cotton yields after pin-head square application of quinclorac was [yield] = [yield with no injury] − 10(quinclorac rate in g ha−1).

Keywords

Quinclorac, [(3,7-dichloro-8-quinolinecarboxylic acid]cotton, Gossypium hirsutum L. ‘DES 119’Crop injuryaerial applicationnontarget application
Type
Weed Control and Herbicide Technology
Information
Weed Science , Volume 40 , Issue 1 , March 1992 , pp. 106 - 109
Copyright
Copyright © 1992 by the Weed Science Society of America 

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References

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