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Title: Preemergence herbicides forpotential use in potato (Solanum tuberosum) production

Author
item Boydston, Rick
item FELIX, JOEL - Oregon State University
item AL-KHATIB, KASSIM - University Of California

Submitted to: Weed Technology
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 6/26/2012
Publication Date: 12/1/2012
Citation: Boydston, R.A., Felix, J., Al-Khatib, K. 2012. Preemergence herbicides forpotential use in potato (Solanum tuberosum) production. Weed Technology. 26:731-739.

Interpretive Summary: Field trials conducted in 2009 and 2010 near Paterson, WA and Ontario, OR evaluated weed control and potato tolerance to several new preemergence applied herbicides; pyroxasulfone, saflufenacil, and KSU12800. These herbicides have potential for controlling weeds in potato that have evolved resistance to currently labeled herbicides. Pyroxasulfone and saflufenacil alone or in tank mixes with several currently labeled herbicides did not injure potatoes at either site in both years. KSU12800 injured potatoes for a period of about 3 to 4 wk after emergence at both locations in 2009 but injury was temporary and potatoes recovered. Pyroxasulfone controlled barnyardgrass, hairy nightshade, and redroot pigweed 96% or greater and suppressed common lambsquarters. Saflufenacil controlled common lambsquarters, hairy nightshade, and redroot pigweed 93% or more at both sites in 2010. KSU12800 controlled common lambsquarters, hairy nightshade, and redroot pigweed well at Ontario, but only partially controlled all three species at Paterson in 2010. In two years of testing, these herbicides did not reduce yield of U.S. no. 1 tubers or total tuber yields compared to standard labeled herbicide treatments when weed control was adequate. These herbicides offer new modes of action for potato herbicides and could be useful for managing herbicide resistant weed populations in potato.

Technical Abstract: Field trials were conducted in 2009 and 2010 near Paterson, WA and Ontario, OR to evaluate weed control and potato tolerance to preemergence applied pyroxasulfone, saflufenacil, and KSU12800 herbicides. Pyroxasulfone at 0.09 to 0.15 kg ai ha-1 and saflufenacil at 0.05 to 0.07 kg ha-1 applied PRE alone or in tank mixes with several currently labeled herbicides did not injure potatoes at either site in both years. KSU12800 at 0.15 kg ha-1 injured potatoes from 18 to 26% for a period of about 4 wk after emergence at Ontario. KSU12800 at 0.29 and 0.45 kg ha-1 injured potatoes from 17 to 38% at 17 DAT at Paterson in 2009. Pyroxasulfone at 0.15 kg ha-1 controlled barnyardgrass, hairy nightshade, and redroot pigweed 96% or greater and suppressed common lambsquarters. Saflufenacil at 0.07 kg ha-1 controlled common lambsquarters, hairy nightshade, and redroot pigweed 93% or more at both sites in 2010. KSU12800 at 0.15 kg ha-1 controlled common lambsquarters, hairy nightshade, and redroot pigweed well at Ontario, but only partially controlled all three species at Paterson in 2010. In two years of testing, these herbicides did not reduce yield of U.S. no. 1 tubers or total tuber yields compared to standard labeled herbicide treatments when weed control was adequate.