Abstract
Oxyfluorfen has been recently labeled for use as a pre-transplant herbicide for use in cole crops. Potential susceptibility to oxyfluorfen injury limits the situations in which this herbicide can be utilized. In a preliminary screen of broccoli cultivars, we observed variable responses to oxyfluorfen applied post-transplant. Two susceptible cultivars, Early Dawn and Green Goliath, were further tested with two tolerant cultivars, Emerald City and Pinnacle, to characterize differences in tolerance. Oxyfluorfen was applied to 3-leaf stage transplants at rates of 100, 200, 400, 800, and 1600 kg/ha in greenhouse and field trials. In addition, preemergent treatment with oxyfluorfen was tested by applying the herbicide immediately following the seeding of pots. The effect of the herbicide was assessed by rating foliar damage (0-9) and by fresh weight measurement taken 2-3 weeks after treatment. At all rates of application with both transplant and preemergent treatments Pinnacle exhibited the greatest level of tolerance exhibiting the least foliar damage and reduction in fresh weight. Green Goliath was very susceptible to oxyfluorfen injury while Early Dawn and Emerald City had intermediate responses.
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