الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
Brown spot disease of rice caused by Helminthosporium oryzae Brede de Haan, synonymous to Drechslera oryzae(The perfect stage is Cochliobalus miyabeanus (Ito and Kuribiyashi)Deechsler ex Dastur is considered one of the most serious diseases of rice growing countries.