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Abstract

Two of the main fungi species affecting rice seed germination are Drechslera oryzae and Thrichoconis padwickii. A field study was conducted to control those pathogens in the following rice growth stages: pre-flowering, flowering, milk and dough. The following fungicides an doses were applied: Daconil 1.5 kg/ha, Dithane M-45 5.0 kg/ha, Vitavax 2.5 l/ha and Sisthane 0.64 l/ha. The control treatment showed levels of D. oryzae and T. padwickii of 41% and 11%, respectively. The lowest levels of both fungi were observed when fungicides were applied before the dough stage. After two applications of Daconil, Dithane M-45, Vitavax and Sisthane, the following levels of D. oryzae were observed: 10.4%, 22.6%, 23.1% and 8.1%, respectively. All fungicides satisfactorily controlled T. padwickii. Weight in grams for each 500 rice grains for the Daconil, Dithane M-45, Vitavax, Sisthane and Control treatments were 15.30, 15.46, 15.43, 15.45 and 14.39, respectively. Useless grain percentages, in the same order, were 4.31, 4.87, 4.10, 3.96 and 8.80.