Abstract:
The present study was conducted to determine the prevalence of watermelon
diseases in nine selected locations of Patuakhali district. Three experiments were
conducted on watermelon diseases and their prevalence and effect of temperature,
relative humidity and rainfall on the diseases. Five different diseases viz.
Alternaria leaf spot, Cercospora leaf spot, Anthracnose, Mosaic diseases and
Rhizopus soft rot were recorded in the survey. Significant pathogens Alternaria
alternata, Cercospora citrullina, Colletotrichum lagenarium, Leaf mosaic virus
and Rhizopus stolonifer were isolated and identified. Results revealed that the
highest disease incidence (20.84%) and severity (18.75%) of alternaria leaf spot
disease and the lowest disease incidence (6.42%) and severity (4.50%) of rhizopus
soft rot was found in selected locations of Patuakhali district. The highest disease
incidence (19.14%) and disease severity (16.33%) was found in Galachipa upazilla
of Patuakhali district where the lowest disease incidence (16.27%) and severity
(14.73%) was found in Patuakhali Sadar Upazilla. Weather component
(temperature, relative humidity and rainfall) had positive correlation with disease
incidence and severity of watermelon. It was observed that with increasing in
temperature, relative humidity and rainfall the disease incidence and severity were
also increased.
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
MASTER OF SCIENCE
IN
PLANT PATHOLOGY
SEMESTER: July-December, 2016
