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Vegetable soybean tolerance to flumioxazin-based treatments for waterhemp control is similar to grain-type soybean

Published online by Cambridge University Press:  23 April 2019

Martin M. Williams II*
Affiliation:
Ecologist, US Department of Agriculture, Agricultural Research Service, Global Change and Photosynthesis Research, Urbana, ILUSA
James L. Moody
Affiliation:
Biological Science Technician (retired), US Department of Agriculture, Agricultural Research Service, Global Change and Photosynthesis Research, Urbana, ILUSA
Nicholas E. Hausman
Affiliation:
Agricultural Science Technician, US Department of Agriculture, Agricultural Research Service, Global Change and Photosynthesis Research, Urbana, ILUSA
*
Author for correspondence: Martin M. Williams II, Email: martin.williams@ars.usda.gov

Abstract

Herbicides registered in vegetable soybean often fail to control waterhemp. The objective of this research was to quantify vegetable soybean tolerance to preemergence herbicides for early-season waterhemp control, including flumioxazin applied alone PRE or in mixture with chlorimuron, metribuzin, or pyroxasulfone at use rates in grain-type soybean. Crop tolerance to the herbicides was tested in field trials with 20 vegetable soybean cultivars and four grain-type cultivars through 4 wk after treatment (WAT). Flumioxazin-based treatments were equally safe, resulting in only minor, transitory crop response (<5% injury 2 WAT) and no effect on crop emergence or early season growth. Flumioxazin mixtures provided greater than 99% control of waterhemp 4 WAT, as evidenced by reduced weed density from 29.7 plants m−2 in the nontreated control to no waterhemp. Flumioxazin applied alone or in tank mixture with chlorimuron, metribuzin, or pyroxasulfone were as safe in vegetable soybean as previously reported in grain-type soybean. Registration of these products in vegetable soybean would provide the industry with additional options for managing waterhemp.

Type
Research Article
Copyright
© Weed Science Society of America, 2019 

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