Abstract
The cause of rice grain spotting (dirty panicles) in Nigeria was studied. The fungus isolated most frequently from discoloured grains was Sarocladium attenuatum. Pathogenicity studies showed that it was capable of causing dirty panicle disease in the absence of insects. Disease severity increased with increasing inoculum. This is the first evidence that S. attenuatum is one of the major causes of dirty panicle disease of rice in Nigeria. Four isolates of S. attenuatum from different locations did not differ significantly in their virulence to three rice cultivars under upland conditions. Inoculations of cultivar BG 6850 at panicle initiation and booting resulted in severe disease and indicated the potential of the fungus to reduce yields. Trials under upland conditions of 69 cultivars of Oryza sativa and 89 of O. glaberrima indicated considerable variation in reactions, dwarf cultivars being generally more susceptible than taller ones.
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