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Crop Responses to Hexazinone, Imazapyr, Tebuthiuron, and Triclopyr

Published online by Cambridge University Press:  12 June 2017

C. Benjamin Coffman
USDA, ARS, Beltsville, MD 20705
J. Ray Frank
USDA, ARS, Frederick, MD 21702
William E. Potts
UMD/USDA, Beltsville MD 20705


Field investigations were conducted for 2 yr to characterize the responses of wheat, kidney bean, field corn, squash, okra, potato, and banana to soil-applied hexazinone, imazapyr, tebuthiuron, and triclopyr at rates used for control of woody perennial plants. Test species were planted at seven selected intervals through the first and second years after herbicide applications to assess residual herbicide activity. Tebuthiuron treatments of 2.2 kg ai ha−1 were not tolerated by any bioassay species planted 436 d after application (DAA). Only potato was tolerant of residual hexazinone 436 DAA. All species except banana generally tolerated residual imazapyr and triclopyr by the second growing season. Indigenous plants repopulated all herbicide-treated areas, except those treated with tebuthiuron, by the third growing season. Plots treated with tebuthiuron were 90% free of indigenous plants 40 mo after herbicide application.

Copyright © 1993 by the Weed Science Society of America 

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