![]() The R biotypes were equally susceptible to MSMA at 2240 g ai ha−1, quinclorac at 840 g ai ha−1, and topramezone at 37 g ai ha−1 as compared to the S biotype. Clethodim at 290 g ai ha−1 reduced dry shoot biomass of the R biotypes and the S biotype to 47 and 21% of the nontreated, respectively. Both R biotypes were cross-resistant to fenoxaprop and fluazifop. ![]() From dose response experiments, the sethoxydim rate required to reduce shoot biomass 50% from the nontreated measured >64-times greater for both resistant (R) biotypes compared to the susceptible (S) biotype. The objectives of this research were to evaluate the resistance levels of these biotypes to acetyl-CoA carboxylase (ACCase) inhibitors and alternative herbicides for control. Two populations of southern crabgrass identified in Georgia turfgrass were suspected to be resistant to sethoxydim.
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