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Potato and Weed Response to Postemergence-Applied Halosulfuron, Rimsulfuron, and EPTC

Published online by Cambridge University Press:  20 January 2017

Rick A. Boydston
Rick A. Boydston*
Affiliation:
Agricultural Research Service, United States Department of Agriculture, Irrigated Agriculture Research and Extension Center, Prosser, WA 99350-9687
*
Corresponding author's E-mail: boydston@pars.ars.usda.gov
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Abstract

Weed control and potato response to halosulfuron applied alone POST and with rimsulfuron or S-ethyl dipropyl carbamothioate (EPTC) were evaluated in 2004 and 2005 near Paterson, WA. Potatoes were injured and exhibited chlorosis and stunted growth after halosulfuron applications of 18, 26, and 35 g/ha. Potato height was reduced 33 and 20% in late May by halosulfuron at 18 or 26 g/ha in 2004 and 2005, respectively. Halosulfuron applied alone failed to control hairy nightshade and large crabgrass. Total tuber yield and U.S. no. 1 yield were reduced 10% in halosulfuron-treated plots because of poor weed control and possibly herbicide injury. Tank-mixing rimsulfuron with halosulfuron improved control of hairy nightshade and large crabgrass and increased potato yield. Tank-mixing EPTC at 2 kg/ha with halosulfuron improved early-season hairy nightshade control, but weed control was poor at row closure. Rimsulfuron applied alone at 18 or 26 g/ha controlled hairy nightshade and large crabgrass without potato injury and resulted in the greatest potato yields.

Keywords

Halosulfuronrimsulfuronhairy nightshade, Solanum sarrachoides Sendt. SOLSAlarge crabgrass, Digitaria sanguinalis L. Scop. DIGSApotato, Solanum tuberosum L. ‘Umatilla’Crop safetyherbicide injuryweed controlweed management
Type
Research
Information
Weed Technology , Volume 21 , Issue 2 , June 2007 , pp. 465 - 469
Copyright
Copyright © Weed Science Society of America 

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