Evaluation of new fungicides in controlling blast (Bl) [India]
1986
Lewin, H.D. | Mariappan, V. | Chelliah, S. (Tamil Nadu Rice Research Inst., Aduthurai (India))
Recently introduced emulsifiable concentrates and wettable powders in Oct-Jan 1984-85 were evaluated for Bl control in a field trial laid out in a randomized block design. The 12 treatments were replicated 4 times; test variety was highly Bl-susceptible IR 50. The fungicides were applied as foliar spray during tillering after disease symptoms appeared, at panicle initiation, and at flowering. Intensity of leaf Bl was scored by the Standard Evaluation System for rice on 25 randomly selected plants from each plot 10 d after the final fungicide application. Neck infection percentage was assessed on five randomly selected hills from each plot. Edifenphos, pyroquilon, and isoprothiolane significantly controlled leaf Bl. Plots treated with edifenphos or pyroquilon yielded 80% higher than the check.
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