Journal
PEST MANAGEMENT SCIENCE
Volume 67, Issue 3, Pages 258-261Publisher
JOHN WILEY & SONS LTD
DOI: 10.1002/ps.2100
Keywords
waterhemp; Amaranthus tuberculatus; Amaranthus rudis; 4-hydroxyphenylpyruvate dioxygenase; herbicide resistance; herbicide synergism
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BACKGROUND:A population of waterhemp in a seed maize production field in central Illinois, United States, was not adequately controlled after post-emergence applications of herbicides that inhibit 4-hydroxyphenylpyruvate dioxygenase (HPPD). RESULTS: Progeny from the field population survived following treatment with mesotrione, tembotrione or topramezone applied to the foliage either alone or in combination with atrazine in greenhouse experiments. Dose response experiments indicated that the level of resistance to the HPPD inhibitor mesotrione is at least tenfold relative to sensitive biotypes. CONCLUSION: These studies confirm that waterhemp has evolved resistance to HPPD-inhibiting herbicides. (C) 2011 Society of Chemical Industry
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