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1 April 2002 Giant Foxtail (Seteria faberi) Seedling Assay for Resistance to Sethoxydim
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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.

Nomenclature: Sethoxydim; giant foxtail, Seteria faberi Herrm. #3 SETFA.

Additional index words: ACCase inhibitor, bioassay.

Abbreviations:ACCase, acetyl-coA carboxylase; DAT, days after treatment; R, resistant; S, susceptible.

JULIE RETRUM and FRANK FORCELLA "Giant Foxtail (Seteria faberi) Seedling Assay for Resistance to Sethoxydim," Weed Technology 16(2), 464-466, (1 April 2002).[0464:GFSFSA]2.0.CO;2
Published: 1 April 2002
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