Efficacy of S-(4-Methylsulfonyloxyphenyl) N-methylthiocarbamate (Methasulfocarb) for Control of Seedling Blight of Rice Plant

Abstract

A new soil fungicide, S-(4-methylsulfonyloxyphenyl) N-methylthiocarbamate (methasulfocarb, Kayabest^®, NK-191), was tested against seedling blight of rice plant caused by several different pathogens with the small scale plastic nursery box, which was 1/10 the size of an ordinary nursery box of rice plant. Methasulfocarb 10D, applied once before seeding by incorporation with nursery box soil included both bed soil and cover soil which had been artificially infested with pathogens at the rate of 60-100mg a. i. per 500ml soil, was equal to or better than the standard rate of control chemicals for control of seedling blight of rice plant which was caused by four major pathogens, namely Rhizopus chinensis, Fusarium roseum, Pythium graminicolum, Trichoderma viride and another pathogen Corticium rolfsii in young rice seedling. Methasulfocarb 10D provided better control of seedling blight of rice plant with single soil application before seeding at the rate of 100mg a. i. per 500ml nursery box soil than the standard rate of control chemicals in medium matured rice seedling which had a longer nursery growing period than the young rice seedlings. Therefore it is suggested that methasulforcarb is a new soil fungicide for the control of seedling blight of rice plant with a broad spectrum of fungicidal activity to several different pathogens at a single soil application before seeding and with long enough residual activity to control the disease in medium matured rice seedling.