| Summary: | We studied the impact of three pre plant herbicides, trifluralin, pendimethalin and prometryn on the incidence and the development of Rhizoctonia solani- induced cotton seedling damping-off in the field. In a field experiment conducted in Safford, Arizona, pre plant application of pendimethalin or prometryn but not trifluralin caused significant (P < 0.05) increases in disease incidence. In another field experiment in Tucson, Arizona, significant (P < 0.05) increase in disease incidence was observed in plots treated with prometryn and not in those treated with pendimethalin and trijuralin. In Tucson field experiment, application of herbicides also affected disease development as judged by the slope of disease progress curves.
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