Abstract:
A pot experiment was carried out during the period from December 2021 to March
2022 to assess the yield loss of mustard due to grey blight disease. The experiment
consists of twelve treatments viz, T
0
ii
= Control (Field spraying with plain water); T
1
=
One field spraying with Rovral 50 WP @ 0.2%; T
2
= Two field spraying with Rovral
50 WP @ 0.2%; T
3
= Three field spraying with Rovral 50 WP @ 0.2%; T
4
= Four
field spraying with Rovral 50 WP @ 0.2%; T
5
= Five field spraying with Rovral 50
WP @ 0.2%; T
6
= Six field spraying with Rovral 50 WP @ 0.2%; T
7
= Seven field
spraying with Rovral 50 WP @ 0.2%; T
8
= Eight field spraying with Rovral 50 WP @
0.2%; T
9
= Nine field spraying with Rovral 50 WP @ 0.2%; T
10
= Ten field spraying
with Rovral 50 WP @ 0.2% and T
11
= Eleven field spraying with Rovral 50 WP @
0.2%.. The experiment was laid out in Randomized Complete Block Design (RCBD)
with three replications. Different treatments comprising different number of sprayings
had remarkable effect on the disease incidence and severity of grey blight, yield and
yield contributing characters of mustard. The lowest (0.0%) percent disease index
(PDI) and the highest yield (934.3 kg/ha) was recorded in case of treatment T
11
where
eleven foliar spraying were applied with Rovral 50 WP @ 0.2% at 7 days interval.
The highest PDI (84%) and the lowest yield (357.6 kg/ha) was counted in case of
treatment T
0
(control). The disease severity (PDI) and yield were varied in case of
other treatments on the basis of number of fungicide spraying. Using the varied
disease severity (PDI) and corresponding yield, the mathematical yield loss
assessment model was constructed as Y = 0.50 + 2.32Xi using the regression
equation.
Description:
A Thesis
Submitted to the Department of Plant Pathology,
Sher-e-Bangla Agricultural University, Dhaka
in partial fulfillment of the requirements
for the degree of
CAUSED BY Alternaria spp.
MASTER OF SCIENCE (MS)
IN
PLANT PATHOLOGY
