J. V. Fernandez, D. Odero, G. MacDonald
Mar 1, 2014
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Crop Protection
Abstract
Pyraflufen-ethyl is a phenylpyrazole herbicide for control of annual and perennial broadleaf weeds. Greenhouse and field studies were conducted to determine pyraflufen-ethyl efficacy for control of Parthenium hysterophorus at the rosette and flowering stages, respectively. Both growth stages were treated with pyraflufen-ethyl at six rates ranging from 0.46 to 14.60 g a.i. ha−1. Aboveground dry weight of rosette P. hysterophorus was reduced 90% by pyraflufen-ethyl at 2.33–2.65 g a.i. ha−1 14 days after treatment (DAT). At the label use rate of 0.91–3.64 g a.i. ha−1 for control of broadleaf weeds, pyraflufen-ethyl was estimated to provide 13–58% and 5–32% control of flowering P. hysterophorus 60 and 87 cm in height, respectively at 21 DAT. These results show that pyraflufen-ethyl can control rosette P. hysterophorus within the label use rate for broadleaf weeds. However, rates higher than the label use rate are required for control of flowering P. hysterophorus, showing that pyraflufen-ethyl must be applied at the early stages of P. hysterophorus growth for effective control.