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ARS Home » Midwest Area » Urbana, Illinois » Global Change and Photosynthesis Research » Research » Publications at this Location » Publication #411394
Research Project: Resilience of Integrated Weed Management Systems in Midwest Crop Production Systems

Location: Global Change and Photosynthesis Research

Title: Snap bean tolerance to preemergence applications of dimethenamid-P, flumioxazin, lactofen, metribuzin, saflufenacil, and sulfentrazone

Author
item KHAN, J MUHAMMAD - Oak Ridge Institute For Science And Education (ORISE)
item Hausman, Nicholas
item SABALLOS, ANA - Oak Ridge Institute For Science And Education (ORISE)
item Landau, Christopher
item Williams, Martin

Submitted to: Weed Technology
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 5/15/2024
Publication Date: 10/17/2024
Citation: Khan, J., Hausman, N.E., Saballos, A., Landau, C.A., Williams, M. 2024. Snap bean tolerance to preemergence applications of dimethenamid-P, flumioxazin, lactofen, metribuzin, saflufenacil, and sulfentrazone. Weed Technology. https://doi.org/10.1017/wet.2024.39.
DOI: https://doi.org/10.1017/wet.2024.39

Interpretive Summary: Weeds in the pigweed family are problematic in snap bean production because stems of pigweed plants that escape control break into pod-sized fragments during crop harvest, contaminating consumer products. Several preemergence herbicides suppress pigweed species; however, snap bean tolerance to such herbicides is poorly documented. This research identified two herbicides, dimethenamid-P and lactofen, that appear safe for use in snap bean production. The impact of this research is that it supports an effort to develop a federal label for use of dimethenamid-P and lactofen on snap bean. Such an outcome would be a welcome addition to the weed management arsenal in the crop.

Technical Abstract: Amaranthus species are problematic weeds in snap bean production systems. They not only reduce crop yields, but their stem fragments contaminate harvested pods. Knowledge of snap bean tolerance to different preemergence (PRE) herbicides is limited; however, it is essential to planning a reliable weed management system, breeding herbicide-tolerant cultivars, and registering herbicides on minor crops such as snap bean. Field trials were conducted in 2021 and 2022 to determine tolerance of eight snap bean cultivars to PRE herbicides with activity on Amaranthus spp., including dimethenamid-P, flumioxazin, lactofen, metribuzin, saflufenacil, and sulfentrazone. Snap bean plant density (no m–2), plant biomass (g plant–1), and canopy biomass (g m–2) 21 days after treatment were used to assess crop tolerance to a range of herbicide rates. Linear mixed-effects regression models were fitted to quantify the relationships between PRE herbicide rate and snap bean cultivar tolerance. Crop response varied among cultivars, PRE herbicides and rates. Based on cultivar responses, the herbicides tested in this study can be grouped into three categories: 1) high tolerance in all cultivars (dimethenamid-P and lactofen), 2) differential cultivar tolerance (flumioxazin and sulfentrazone), and 3) high sensitivity in all cultivars (metribuzin and saflufenacil). Results indicate there is a high margin of crop safety with dimethenamid-P and lactofen for weed control in snap bean. Differential cultivar tolerance to flumioxazin and sulfentrazone are likely driven by genetic variability among cultivars.