Bioherbicidal potential of Drechslera longirostrata as management for weed (Rottboellia cochichinensis) grass.
An isolate of indigenous fungus Drechsclera longirostrata (Subram.) Subram. Was isolated from diseased itch grass (Rottboellia cochichinensis) in Agricultural field, Madhya Pradesh, India and was evaluated in the laboratory and greenhouse as a potential bioherbicide. On inoculated itch grass seedlings, disease symptom appeared 24 h post inoculation as discrete lesions with watery dark border, which eventually expanded and caused extensive necrosis on the leaves. The ability of this fungus to cause severe disease on this weed depended on the phonological growth stages. This fungus caused 100% mortality on the 2- and 4-leaf stage but was only able to cause about 90% disease severity on 6-leaf stage and matured plants. In host-specificity tests, D. longirostrata was found to be highly pathogenic on itch grass. The fungus infected other closely related grassy weeds.