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Giant Foxtail (Seteria faberi) Seedling Assay for Resistance to Sethoxydim

Published online by Cambridge University Press:  20 January 2017

Julie Retrum  and
Frank Forcella
Julie Retrum
Affiliation:
Division of Science, University of Minnesota-Morris
Frank Forcella*
Affiliation:
USDA-ARS, North Central Soil Conservation Research Laboratory, Morris, MN 56267
*
Corresponding author's E-mail: [email protected].
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Abstract

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.

Keywords

Sethoxydimgiant foxtail, Seteria faberi Herrm. #3 SETFAACCase inhibitorbioassayACCase, acetyl-coA carboxylaseDAT, days after treatmentR, resistant; S, susceptible
Type
Note
Information
Weed Technology , Volume 16 , Issue 2 , June 2002 , pp. 464 - 466
Copyright
Copyright © Weed Science Society of America 

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References

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