Sixty-six single hill plants were randomly selected and pagged Disease severity of leaf blight was scored on all leaves including flag leaf separately. Three srades of commulative disease severity were calculated and regressed with grain yield to establish a relationship between percentage disease severity and grain yield The commulative disease severity based on flag leaf or 2nd plus flag leaves gives better estimate of yield loss at various leaves of disease severity.

Sixty-six single hill plants were randomly selected and pagged Disease severity of leaf blight was scored on all leaves including flag leaf separately. Three srades of commulative disease severity were calculated and regressed with grain yield to establish a relationship between percentage disease severity and grain yield The commulative disease severity based on flag leaf or 2nd plus flag leaves gives better estimate of yield loss at various leaves of disease severity.