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23 April 2019 Vegetable soybean tolerance to flumioxazin-based treatments for waterhemp control is similar to grain-type soybean
Martin M. Williams, James L. Moody, Nicholas E. Hausman
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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.

Nomenclature: chlorimuron; flumioxazin; metribuzin; pyroxasulfone; tall waterhemp, Amaranthus tuberculatus (Moq.) J.D. Sauer, AMATU; soybean, Glycine max (L.) Merr

© Weed Science Society of America, 2019.
Martin M. Williams, James L. Moody, and Nicholas E. Hausman "Vegetable soybean tolerance to flumioxazin-based treatments for waterhemp control is similar to grain-type soybean," Weed Technology 33(3), 530-534, (23 April 2019). https://doi.org/10.1017/wet.2019.15
Received: 2 October 2018; Accepted: 15 February 2019; Published: 23 April 2019
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KEYWORDS
Crop injury
edamame
herbicide tolerance
minor crop
waterhemp
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