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Response of Direct-Seeded Dry Bulb Onion to Simulated Glyphosate Drift with Variable Rates and Application Timings 公开 Deposited

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https://ir.library.oregonstate.edu/concern/articles/dn39x215z

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Abstract
  • Field studies were conducted in 2011 at the Malheur Experiment Station, Ontario, OR and Prosser, WA to evaluate the effect of simulated glyphosate drift on direct-seeded dry bulb onion. Glyphosate was applied at 8.6, 25.8, 86, 290, 434, and 860 g ae ha⁻¹ when onion plants were at the flag-, two-, four-, and six-leaf stages. Onion foliar injury was directly related to the glyphosate dose and varied with application timing. Foliar injury at 7 d after treatment (DAT) ranged from 0 to 12% for glyphosate ≤ 25.8 g ha⁻¹. Foliar injury increased at 21 DAT when glyphosate was applied ≥ 25.8 g ha⁻¹ to plants at the flag- and four-leaf stage, and ranged from 24 to 99%. The 50%-injury glyphosate dose at 21 DAT was lowest when onion was treated at the four-leaf and flag stages and was estimated to be 76.8 and 81 g ha⁻¹, respectively. Onion injury severity increased when glyphosate was applied at ≥ 86 g ha⁻¹ and eventually resulted in plant death at 860 g ha⁻¹. Foliar injury was inversely correlated to U.S. no. 1 onion yield. Onions displayed sensitivity to very low glyphosate doses especially at the four-leaf stage. Shikimic acid accumulation increased with the increase in glyphosate dose and was positively correlated with foliar injury and negatively correlated with plant height and onion yield.
  • Keywords: glyphosate application timing, Dry bulb onion, shikimic acid
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  • Joel Felix, Rick Boydston, and Ian C. Burke (2012) Response of Direct-Seeded Dry Bulb Onion to Simulated Glyphosate Drift with Variable Rates and Application Timings. Weed Technology: October-December, Vol. 26, No. 4, pp. 747-756.
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  • 26
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  • 4
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