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Evaluation of several fungicides and adjuvant materials for control of brown spot of wild rice zizania aquatica



Evaluation of several fungicides and adjuvant materials for control of brown spot of wild rice zizania aquatica



Plant Disease 66(11): 1001-1003



Several fungicides separately and mancozeb in combination with each of 5 different adjuvant materials were field-tested for effectiveness in reducing brown spot of wild rice (Z. aquatica) caused by Drechslera oryzae (Bipolaris oryzae) and D. sorokiniana (B. sorokiniana). The fungicides were applied on wild rice plants at 14-day intervals from early flowering until 26 days before harvest. The following fungicides significantly (P = 0.05) controlled brown spot (114 l of spray per hectare): benomyl 50WP [wettable product] at 1.1 kg/ha; chlorothalonil 6F at 2.9 kg/ha; mancozeb at 2.3 kg/ha; fenapanil (RH-2161) 50WP at 0.6 kg/ha; and iprodione (RP 26019) 50 flowable at 6.4 kg/ha. Two or three applications of mancozeb with Pinolene (Nu-Film) at 0.6 ml/l or Acrylocoat at 1.2 ml/l resulted in significantly better control than the recommended 4 applications of mancozeb with Triton CS-7 at 1.2 ml/l.

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Accession: 005401484

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