Abstract:
An experiment was set up at the field of Sher-e-Bangla Agricultural University from
December, 2020 to March 2021. The present study was aimed to evaluate effectiveness of
several cultural practices viz. inter cropping by coriander, border cropping by wheat, black
polythene mulch, reflective aluminum mulch and plant extracts viz. neem leaf, papaya leaf,
mahogany bark for the management of viral disease of BARI squash 1. The virus in squash
was detected through biological method and DAS-ELISA test. Most of the samples reacted
positively against the antiserum of Cucumber mosaic virus. In response to different selected
treatments against the viral disease, growth and growth contributing characters, yield and yield
attributes of squash were recorded. Significant variations were found among different
treatments against virus disease management in squash. Based on the last observation, it was
found that viral infection varied from 22.22 % to 83.33% and 11.10% to 83.30% in terms of
disease incidence and disease severity, respectively. Maximum prevalence (disease incidence
83.33% and disease severity 83.30%) was found in T
0
(Control) and minimum prevalence
(disease incidence 22.22% and disease severity 11.10%) was observed in T
4
(Reflecting mulch)
followed by T
5
(Neem leaf extract) (disease incidence 44.44% and disease severity 24.96%).
The effect of different treatments on yield and yield contributing characters also showed
significant variations among them, the highest yield (ton/ha) was found in T
4
(Reflecting
mulch) followed by T
5
(Neem leaf extract) and the lowest yield (ton/ha) was found in T
0
(control). It was also found that the percent of disease incidence and severity were positively
correlated with the number of insect vector. On the contrary, the yield (ton/ha) was negatively
correlated with the value of percent disease incidence and severity and insect population in the
field of squash. From the findings of the present study, it may be concluded that reflecting
mulch (aluminum foil) and neem leaf extracts can be used as ecofriendly approaches for the
management of viral disease of squash. However, further investigations are needed to justify
the present findings to get more reliable result.
Description:
A Thesis
Submitted to the Department of Plant Pathology,
Sher-e-Bangla Agricultural University, Dhaka
in partial fulfillment of the requirements
or the degree of
CAUSED BY Alternaria spp.
MASTER OF SCIENCE (MS)
IN
PLANT PATHOLOGY
