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United States Department of Agriculture

Agricultural Research Service

Research Project: Ecology, Management and Environmental Impact of Weedy and Invasive Plant Species in a Changing Climate

Location: Global Change and Photosynthesis Research Unit

Title: Vegetable soybean tolerance to bentazon, fomesafen, imazamox, linuron, and sulfentrazone

Authors
item Williams, Martin
item Nelson, Randall

Submitted to: Weed Technology
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: April 18, 2014
Publication Date: N/A

Interpretive Summary: In order to quantify vegetable soybean tolerance five herbicides being considered for use on the crop in the near future, this work assembled a collection of as many as 128 private and public vegetable soybean entries. Responses of entries to the herbicides were compared to responses of grain-type soybean, including certain grain-type entries with documented herbicide tolerance or sensitivity. Results show bentazon, fomesafen, imazamox, linuron, and sulfentrazone pose no greater risk of adverse crop response to vegetable soybean germplasm than the grain-type soybeans to which they have been applied for years. The impact of the work is that additional herbicide registrations will provide the vegetable industry with valuable, cost-effective tools for use in the development of integrated weed management systems for this emerging crop.

Technical Abstract: Poor weed control, resulting from limited herbicide availability and undeveloped integrated weed management systems, is a major hurdle to production of vegetable soybean in the U.S. Vegetable soybean, the same species as grain-type soybean, has few registered herbicides due to unknown crop tolerance. Tolerance of as many as 128 vegetable soybean entries to a 2X application rate of bentazon, fomesafen, imazamox, linuron, and sulfentrazone were quantified within four weeks after treatment in field trials. Several grain-type soybean entries were included for comparison, including entries with known herbicide tolerance or sensitivity. Injury and seedling growth reduction to all vegetable entries was comparable to all grain-type entries for fomesafen, linuron, and sulfentrazone; and less than all grain-type entries for bentazon and imazamox. Responses of ten of the more widely used vegetable soybean entries were comparable to grain-type entries with known herbicide tolerance. Bentazon, fomesafen, imazamox, linuron, and sulfentrazone pose no greater risk of adverse crop response to vegetable soybean germplasm than the grain-type soybeans to which they have been applied for years. Since initiation of this research, linuron is now registered for use on the crop. Development of integrated weed management systems for vegetable soybean would benefit from additional herbicide registrations.

Last Modified: 10/31/2014
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