Herbicide Resistant Weeds

Response of MSMA-resistant and -susceptible common cocklebur (Xanthium strumarium) biotypes to cotton (Gossypium hirsutum) herbicides and cross-resistance to arsenicals and membrane disruptors.

Nimbal, C. I., D. R. Shaw, S. O. Duke, and J. D. Byrd Jr. 1995. Response of MSMA-resistant and -susceptible common cocklebur (Xanthium strumarium) biotypes to cotton (Gossypium hirsutum) herbicides and cross-resistance to arsenicals and membrane disruptors. Weed Technology. 9: 440-445.
Greenhouse experiments were conducted to evaluate PRE and POST cotton herbicides for control of MSMA-resistant (R) and -susceptible (S) common cocklebur biotypes, and to determine potential cross-resistance of the R biotype to other arsenical and membrane disruptor herbicides. Cyanazine and clomazone applied PRE were the most effective herbicides for control of R populations. Lactofen or cyanazine in combination with MSMA controlled R and S biotypes better than fluometuron or pyrithiobac combined with MSMA. MSMA-resistant common cocklebur was not cross-resistant to other arsenical herbicides. Significant differences in cellular electrolyte leakage and chlorophyll content of the treated leaf between biotypes were not evident for paraquat, acifluorfen and MSMA.

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