Abstract

Tricyclazole and mancozeb effectively inhibited four vital functions viz., spore germination, germ tube elongation, mycelial growth and sporulation of four rice pathogens tested at different concentrations of the fungicides. Tricyclazole at 500 ppm was highly effective against Pyricularia oryzae and Thanatephorus cucumeris whereas a concentration of 1000 to 1500 ppm was required to inhibit Helminthosporium oryzae and Sarocladium oryzae. Mancozeb around 500 ppm was highly inhibitory to. P. oryzae, at 1000 to 1500 ppm to H. oryzae and at 1000 to 2000 ppm to T. cucumeris, whereas even at 200 ppm it was inhibitory to mycelial growth of S. oryzae.

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