Submitted to: Phytopathology
Publication Type: Abstract Only
Publication Acceptance Date: 9/17/1998
Publication Date: N/A
Technical Abstract: Ten fungicides were tested for efficacy to control gummy stem blight (GSB) of cantaloupe in 1997-98. Plants were inoculated twice with ca. 300,000 viable conidia/ml of a benomyl resistant Didymella bryoniae isolate [DB(TX)97-128]. Plants treated with four applications of azoxystrobin at 224.0 g/ha had significantly less (p=0.05) GSB lesions on fruit, higher marketable yield, lower foliar disease ratings, and fewer stem lesions than plants receiving other treatments in field studies. Chlorothalonil at 2.5 kg/ha and cyprodinil at 280.0 g/ha also effectively controlled GSB on fruit, stems, and foliage significantly better than the other fungicides or control, but to a lesser degree than azoxystrobin. Marketable yield, percentage of plants with fruit and stem lesions, and foliar disease ratings were not significantly different on plants treated with benomyl as compared with the control. Additional fungicides are currently being evaluated for efficacy to control GSB.