Submitted to: Weed Technology
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 1/15/2017
Publication Date: 5/1/2017
Citation: Williams II, M.M., Hausman, N.E., Moody, J.L. 2017. Vegetable soybean tolerance to pyroxasulfone. Weed Technology. 31:416-420.
Interpretive Summary: Pyroxasulfone could help control weeds in edamame; however, pyroxasulfone is not currently registered in part because crop tolerance to the herbicide is unknown. Response of 21 edamame cultivars to pyroxasulfone applications were compared to two grain-type soybean cultivars. Results show pyroxasulfone poses no greater risk of adverse crop response to edamame than grain-type soybean to which the herbicide has been applied for years. The impact of the work is that registration of pyroxasulfone would provide the vegetable industry with a valuable, cost-effective tool for use in the development of integrated weed management systems for edamame.
Technical Abstract: If registered for use on vegetable soybean, pyroxasulfone would fill an important gap in weed management systems in the crop. In order to determine the potential crop injury risk of pyroxasulfone on vegetable soybean, the objective of this work was to quantify vegetable soybean tolerance to pyroxasulfone applied PRE and EPOST. Twenty-one vegetable soybean and two grain-type soybean cultivars were treated with 417 g pyroxasulfone ha-1 (2X recommended field use rate) PRE, EPOST, or left nontreated. Plant population density was unaffected by pyroxasulfone. Only low levels (<10%) of crop injury were observed within a few weeks after PRE and EPOST treatments. Soybean cultivars were not differentially affected by pyroxasulfone, as evidenced by the lack of interactions between cultivar and treatment for any crop response variable. The low amount of risk of crop injury associated with pyroxasulfone is no different for vegetable soybean cultivars grown in the U.S. for commercial production than grain-type soybean.