Abstract:
The experiment was conducted in the farm of Sher-e-Bangla Agricultural University
and central laboratory of the Department of Plant Pathology, Sher-e-Bangla
Agricultural University, Dhaka-1207 during the Rabi season from November 2014 to
June 2015. The experiment was laid out in a RCBD (one factor) with three
replications. Multiple treatment experiment with 11 treatments, viz. To (control); Tl (1
spray with Tilt 250 EC @ 0.1%); T2 (2 sprays with Tilt 250 EC @ 0.1%); T3 (3 sprays
with Tilt 250 EC @ 0.1%); T4 (4 sprays with Tilt 250 EC @ 0.1%); r,(5 sprays with
Tilt 250 EC @ 0.1%); T6 (6 sprays with Tilt 250 EC @ 0.1%); T7 (7 sprays with Tilt
250 EC @ 0.1%); Ts (8 sprays with Tilt 250 EC @ 0.1%); T9 (9 sprays with Tilt 250
EC @ 0.1%); TIO (10 sprays with Tilt 250 EC @ 0.1%) were applied in the
experiment to make the variation in the disease severity and respective yield of treated
plot. Different treatment comprising different number of spraying had remarkable
influence the disease severity of leaf blight, yield and yield contributing characters of
wheat. The lowest (0.0%) percent disease index (PDI) and the highest yield (5.35t1ha)
was recorded in case of treatment Tro where 10 spraying were done with Tilt-250 EC
@ 0.1%. The highest PDI and the lowest yield were counted in case of treatment To
(control). The disease severity and yield was varied significantly on the basis of
number of spraying. Using the varied disease severity (PDI) and the corresponding
yield the regression equation for yield loss assessment was constructed as Y = 2.58+
0.40Xi where 0.4 % loss of yield would be incurred for increasing each percent of
disease severity (PDI).
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
