Abstract:
Prevalence of Xanthomonas axonopodis pv. citri on citrus causing canker on citrus
fruits transported from different districts of Bangladesh to the wholesale markets
of Dhaka was studied during September 2012 to May 2014. Survey revealed that
the highest incidence and severity of canker of citrus were recorded on the fruits
transported from Chittagong in the month of September and May, respectively and
the lowest incidence and severity were recorded on the fruits transported from
Gazipur and Munshiganj, respectively in the month of January. A positive
correlation was observed between the incidence and severity of canker with
temperature, relative humidity and rainfall. The bacterium Xanthomonas
axonopodis pv. citri was isolated from the canker infected part of citrus fruits and
it’s morphological, biochemical and cultural features were studied. The bacterium
was gram negative, rod shaped and showed positive results in KOH solubility test,
starch hydrolysis test, catalase test, citrate utilization test, motility indole urease
agar circular, small, flattened colonies on SX medium. Study on the effect of
environmental factors on canker affected citrus seedlings indicated that leaf
infection
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
IN
PLANT PATHOLOGY
SEMESTER: JULY-DECEMBER, 2013
