Abstract:
An experiment was conducted at the Farm of Sher-e-Bangla Agricultural
University, Dhaka during the period from December 2005 to April 2006 to study
the effect of physical and chemical seed treatments on leaf spot (Bipolaris
sorokinianaj and grain yield of wheat.There were ten treatments viz. farmer's
stored seed (TI), apparently healthy seed (T2), farmer's stored seed treated with
Vitavax-200 @ 0.4% (T3), apparently healthy seed treated with Vitavax-200 @
0.4% (T4), fanner's stored seed washed with water (Ts), apparently healthy seed
washed with water (T6), fanner's stored seed treated with brine solution @ 2%
(T7), apparently healthy seed treated with brine solution @ 2% (T8), washed
farmer's stored seed treated with brine solution @ 2% (T9) and washed apparently
healthy seed treated with brine solution @ 2% (TIO). The highest germination was
counted 84.20% and 86.08% respectively at 10 and 15 DAS in the treatment T4
and the lowest germination 49.84% and 55.54% at 10 and 15 DAS, respectively
was recorded in the treatment TI that served as control. The lowest disease severity
were recorded at panicle initiation stage, flowering stage, milking stage and hard
dough _stage under the treatment T4. which were 0.06, 0.19, 0.36 and 0.84,
respectively. On the other hand the highest disease severity were recorded at
panicle initiation stage, flowering stage, milking stage and hard dough stage under
the treatment TI, which were 0.55, 1.21, 1.69 and 2.53, respectively. The highest
grain yield (3.5 t/ha) was obtained in treatment T4, which was 75% increased over
control (TI).
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 (MS)
IN
PLANT PATHOLOGY