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.
