Скачать или смотреть Rice leaf spot Disease

Narrow brown leaf spot of rice, caused by the fungus Cercospora janseana, varies in severity from year to year and is more severe as rice plants approach maturity.
Leaf spotting may become very severe on the more susceptible varieties, and the disease causes severe leaf necrosis.

Premature ripening, yield reduction and reduced milling can occur.
Symptoms include short, linear, brown lesions found most commonly on leaf blades .

Symptoms also occur on leaf sheaths, pedicels and glumes. Leaf lesions are 2 millimeters to 10 millimeters long and about 1 millimeter wide. The lesions tend to be narrower, shorter and darker brown on resistant varieties and wider and lighter brown with gray necrotic centers on susceptible varieties. Abundant sporulation occurs on the
lesions during extended wet periods