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Abstract

IN VITRO EVALUATION OF FUNGICIDES AND TWO SPECIES OF TRICHODERMA AGAINST SAROCLADIUM ORYZAE CAUSING SHEATH ROT OF PADDY (ORYZA SATIVA L.)

Kalaiselvi. Selvaraj* and Panneerselvam. Annamalai

ABSTRACT

Sheath rot of paddy caused by Sarocladium oryzae is an important disease of paddy inflicting heavy losses. The present investigation was carried out to test the efficacy of fungicides and two species of Trichoderma inhibiting the pathogen in vitro. Fungicides viz. Carbendazim (Bavistin 50% wp), Captaf (Captan-50 wp), Mancozeb (Dithane-75), Copperoxychloride (Blitox -50wp), Ethanol and Methanol were tested by poisoned food technique against Paddy fruit pathogen (S.oryzae) in PDA medium. All the fungicides were significantly proved effective. Among them, Carbendazim at 0.20% showed 85.2% inhibition of the mycelial growth of the pathogen. Among the two species of Trichoderma tested, T.harzianum was found to be most effective with 96% inhibition followed by T. viride 86 % inhibition respectively over control after 7th days of incubation.

Keywords: Paddy, Sarocladium oryzae, Fungicide, Trichoderma spp.


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