POTENTIALITY OF PLANT EXTRACT IN CONTROLLING LEAF BLIGHT {Bipolaris sorokiniana) OF WHEAT

Abstract

Potentiality of plant extract in controlling leaf blight tBipolarls .. orokinlanaj of wheat was earned out during the period from june, 2006 to 1arch, 2007 The experiments were conducted in the Seed Health Laboratory, Department of Plant Pathology and in the farm of the Sher-e-Bangla Agricultural University, Dhaka P1 imarily 24 plant species were evaluated for their antifungal activity against H . . sorokiniana by an mvttro test. Among them 13 species were found prornismg and selected for field evaluation against leaf blight disease All the plant extracts reduced the incidence of H. sorokiniana over untreated control The h ighest reduction was found m case of treating seeds with turmeric rhizome extract Among the botanicals, durba leaf extract performed the highest percent of healthy seedlings It has been observed that allamanda leaf extract showed the highest gerrninat ion and highest vigor mdex m compare to control Among the botanicals onion bulb e rrract treated seeds resulted lowest leaf blight severity in compare to untreated control Seed treatment with oruon bulb extract also showed the best result m producing higher number of spikelets/ear, number of grains/ear, weight of grain/panicle and weight of straw/panicle in compared to untreated control The treatment T2 (Onion bulb extract) and T (Allamanda leaf extract) resulted highest grain yield (3 92 g/plot) over untreated control.