Efficacy of fungicides on hybrid rice seed discoloration and seed infection
1988
Merca, S. | Matias, D. | Huelma, C. | Mew, T.W. | Virmani, S.S. (International Rice Research Inst., Los Banos, Laguna (Philippines))
Daconil, Bas 346 and Benlate plus Dithane M-45 were used at recommended rates in 2 spray schedules in hybrid rice plants to evaluate their effects on seed infection and seed discoloration using 2-factor RCBD. IR 54752A and ARC 11353R were used during the regular wet season planting in June 1987. The 2-spray schedules were: a.) application of sprays 2 weeks before booting, and b.) application at booting, both followed by weekly sprays thereafter. The second spray schedule significanty reduced seed discoloration on R lines but not on A lines. Based on standard blotter test results for seed borne organisms, the 2-spray schedules were not significant, but the fungicides lowered significantly the incidence of the following seedborne organisms: Trichoconis padwickii, Fusarium semitectum, Phoma, Nigrospora, both on A and R lines. The fungicides were observed to increase significantly the incidence of Curvularia spp. Bas 346 was observed more effective against the majority of the seed borne fungi encountered in the tests than Benlate plus Dithane M-45, while Daconil had the least effect.
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