Spray deposition, adjuvants, and physiochemical properties affect benzobicyclon efficacy

Chad Brabham; Jason K. Norsworthy; Craig A. Sandoski

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Spray deposition, adjuvants, and physiochemical properties affect benzobicyclon efficacy

机译：Spray deposition, adjuvants, and physiochemical properties affect benzobicyclon efficacy

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Benzobicyclon is a new pro-herbicide being evaluated in the Midsouth United States as a post-flood weed control option in rice. Applications of benzobicyclon to flooded rice are necessary for efficacious herbicide activity, but why this is so remainsunknown. Two greenhouse experiments were conducted to explore how herbicide placement (foliage only, flood water only, foliage and flood water simultaneously) and adjuvants (nonionic surfactant, crop oil concentrate, and methylated seed oil MSO) affectherbicide activity. The first experiment focused on importance of herbicide placement. Little to no herbicidal activity (82 of the weed control and biomass reduction achieved when benzobicyclon was applied to flood water and foliage simultaneously. The second experiment concentrated on adjuvant type and benzobicyclon efficacy when applied to foliage and flood water simultaneously. At 28 days after treatment, benzobicyclon alone at 371 g ai ha~(-1) provided 29 and 67 control of three- to five-leaf barnyardgrass and Amazon sprangletop, respectively. The inclusion of any adjuvant significantly increased control, with MSO providing near-complete control of barnyardgrass and Amazon sprangletop. Furthermore, we used the physiochemical properties of benzobicyclon and benzobicyclon hydrolysate to derive theories to explain the complex activity of benzobicyclon observed in our study and in field trials. Benzobicyclon applications should contain an oil-based adjuvant and must be applied to flooded rice fields for optimal activity.

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《Weed Technology: A journal of the Weed Science Society of America》 |2019年第2期|258-262|共5页
作者
Chad Brabham; Jason K. Norsworthy; Craig A. Sandoski;
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作者单位

Postdoctoral Research Associate, Department of Crop, Soil, and Environmental Sciences, University of Arkansas, Fayetteville, AR, USA;

Professor and Elms Farming Chair of Weed Science, Department of Crop, Soil, and Environmental Sciences, University of Arkansas, Fayetteville, AR, USA;

Southern Region Field Development, Gowan USA, Collierville, TN, USA;

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正文语种英语
中图分类植物保护;
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Pro-herbicide; rice flood; absorption;

Spray deposition, adjuvants, and physiochemical properties affect benzobicyclon efficacy

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