Abstract
The most common and important foliar diseases of rice in the southern United States are sheath blight, blast, stem rot, brown leaf spot, narrow brown leaf spot and leaf smut. Fungicides have been evaluated for more than 20 years for efficacy against these diseases at the Rice Research Station in Crowley, Louisiana, USA in small plot experiments. Five fungicides are presently registered for commercial use. The commercial fungicides benomyl, propiconazole, iprodione, copper plus sulfur, and thiabendazole have received registrations since 1976. Benomyl, propiconazole, and Iprodione have similar activity against sheath blight but thiabendazole and copper plus sulfur are not recommended because of poor performance. Benomyl also has activity against blast and narrow brown leaf spot. Propiconazole gives excellent control of narrow brown leaf spot and leaf smut. Iprodione suppresses the brown leaf spot disease. Several new fungicides which are narrow spectrum and specific for sheath blight control will soon be registered.
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