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Giant foxtail (Seteria faberi) seedling assay for resistance to sethoxydim
Repeated application of acetyl-coA carboxylase-inhibiting herbicides, such as sethoxydim, may select for resistant (R) weed populations, making a rapid and reliable seedling bioassay a useful tool. Such a bioassay was developed to determine shoot and root responses of giant foxtail seedlings to sethoxydim. Root and shoot elongation of susceptible (S) and R giant foxtail seedlings was measured at 3 and 6 d after exposure to 0.1 to 100 mg/L sethoxydim. A bioassay concentration of 10 mg/L sethoxydim easily discriminated between S and R biotypes of giant foxtail at 6 d after exposure, with R:S shoot and root growth ratios of 3 and 10, respectively.
: a journal of the Weed Science Society of America Apr/June 2002. v. 16 (2)
Journal Articles, USDA Authors, Peer-Reviewed
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