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Tolerance of Chickpeas to Postemergence Broadleaf Herbicides

Published online by Cambridge University Press:  20 November 2017

Rick A. Boydston ,
Howard Nelson  and
Bernardo Chaves-Cordoba
Rick A. Boydston*
Affiliation:
Research Agronomist, Legume Genetics and Physiology Research Unit, Agricultural Research Service, United States Department of Agriculture, Prosser, WA
Howard Nelson
Affiliation:
Agronomist, Central Washington Grain Growers, Wilbur, WA
Bernardo Chaves-Cordoba
Affiliation:
Research Associate, Washington State University, Prosser, WA
*
Author for correspondence: Rick A. Boydston, Legume Genetics and Physiology Research Unit, Agricultural Research Service, United States Department of Agriculture, Prosser, WA 99350. (Email: [email protected])
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Abstract

Chickpea producers currently have no POST applied herbicides labeled for broadleaf weed control and rely heavily on PRE herbicides to manage weeds. Severe crop losses from broadleaf weed competition and harvest losses from weeds impeding harvest can occur when PRE herbicides perform poorly. Chickpea tolerance to POST applications of acifluorfen at 0.42 kg ai ha-1 and fomesafen at 0.28 kg ai ha-1 was tested at two sites in 2015. In 2016, both herbicides were tested on chickpeas when applied alone and in combination with pyridate at three sites. Acifluorfen and fomesafen injured chickpeas from 8 to 25% at 1 week after treatment (WAT) and 3 to 8% at 4 WAT in 2015 and from 16 to 40% at 1 WAT and 2 to 36% at 4 WAT in 2016. Pyridate applied POST at 1.00 kg ai ha-1 did not injure chickpeas or reduce yields. When pyridate was tank mixed with either acifluorfen or fomesafen, chickpea injury increased, but chickpeas recovered and yielded similar to nontreated checks or pyridate-treated plots. A low rate of metribuzin at 0.06 kg ai ha-1 tank mixed with pyridate had little impact on chickpea injury or weed control. In 2015, Russian thistle was controlled 100% by acifluorfen and fomesafen at Prosser at 28 DAT and both herbicides controlled the weed only 63% at Wilbur at 25 DAT. In 2016, all herbicide treatments reduced broadleaf weed densities equally ranging from 95 to 100% at Paterson, 50 to 100% at Prosser, and 78 to 98% at Wilbur. Chickpea yield was similar among POST herbicide treatments in all site-years. Acifluorfen, fomesafen, and pyridate have potential to improve control of susceptible broadleaf weeds that escape PRE herbicides chickpea production, but the potential for crop injury with acifluorfen and fomesafen warrant further evaluation.

Keywords

Robert Nurse, Agriculture and Agri-Food CanadaAcifluorfenfomesafenmetribuzinpyridatechickpea, Cicer arietinum L.Garbanzo beansusceptibilitytolerance
Type
Weed Management-Other Crops/Areas
Information
Weed Technology , Volume 32 , Issue 2 , April 2018 , pp. 190 - 194
Copyright
© Weed Science Society of America, 2017 

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