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27 March 2019 Preplant and Residual Herbicide Application Timings for Weed Control in No-Till Soybean
Kurt M. Vollmer, Mark J. VanGessel, Quintin R. Johnson, Barbara A. Scott
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Abstract

Timely herbicide applications for no-till soybean can be challenging given the diverse communities of both winter and summer annual weeds that are often present. Research was conducted to compare various approaches for nonselective and preplant weed control for notill soybean. Nonselective herbicide application timings of fall (with and without a residual herbicide) followed by early-spring (4 wk before planting), late-spring (1 to 2 wk before planting), or sequential-spring applications (4 wk before planting and at planting) were compared. Spring applications also included a residual herbicide. For consistent control of winter annual weeds, two herbicide applications were needed, either a fall application followed by a spring application or sequential-spring applications. When a fall herbicide application did not include a residual herbicide, greater winter annual weed control resulted from early- or sequential-spring treatments. However, application timings that effectively controlled winter annual weeds did not effectively control summer annual weeds that have a prolonged emergence period. Palmer amaranth and large crabgrass control at 4 wk after planting was better when the spring residual treatment (chlorimuron plus metribuzin) was applied 1 to 2 wk before planting or at planting, compared with 4 wk before planting. Results indicate that in order to optimize control, herbicide application programs in soybean should coincide with seasonal growth cycles of winter and summer annual weeds.

Nomenclature: Chlorimuron; metribuzin; large crabgrass, Digitaria sanguinalis (L.) Scop.; Palmer amaranth, Amaranthus palmeri S. Watson; soybean, Glycine max (L.) Merr

© Weed Science Society of America, 2019.
Kurt M. Vollmer, Mark J. VanGessel, Quintin R. Johnson, and Barbara A. Scott "Preplant and Residual Herbicide Application Timings for Weed Control in No-Till Soybean," Weed Technology 33(1), 166-172, (27 March 2019). https://doi.org/10.1017/wet.2018.105
Received: 18 July 2018; Accepted: 15 November 2018; Published: 27 March 2019
JOURNAL ARTICLE
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KEYWORDS
Fall herbicide application
Herbicide application timing
horseweed
Residual herbicide
sequential herbicide application
spring herbicide application
winter annual weeds
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