Abstract:
Potentiality of plant extract in controlling leaf blight (Bipolaris sorokiniana) of
wheat was carried out during the period from june, 2006 to March, 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.
Primarily 24 plant species were evaluated for their antifungal activity against B.
sorokiniana by an invitro test. Among them 13 species were found promising and
selected for field evaluation against leaf blight disease. All the plant extracts
reduced the incidence of B. sorokiniana over untreated control. The highest
reduction was found in 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
germination and highest vigor index in compare to control. Among the botanicals
onion bulb extract treated seeds resulted lowest leaf blight severity in compare to
untreated control. Seed treatment with onion bulb extract also showed the best
result in 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 T
2
(Onion bulb extract) and T
(Allamanda leaf extract) resulted highest
grain yield (3.92 g/plot) over untreated control.
Description:
A Thesis
Submitted to the Faculty of Agriculture,
Sher-e-Bangla Agricultural University, Dhaka,
in partial fulfillment of the requirements
for the degree of
MASTER OF SCIENCE
IN
PLANT PATHOLOGY
SEMESTER: JANUARY - DECEMBER, 2007
