Abstract:
An experiment was conducted to observe the prevalence of different diseases of
potato in selected cold storages of Munshiganj and to identify the causal agent
that causes potato deterioration at cold storages. The survey was conducted at
different cold storages of Munshiganj and In-vitro experiments were conducted in
the MS Laboratory of Department of Plant Pathology, Sher-e-Bangla Agricultural
University, during the period of July 2016 to May 2017. Potato samples were
collected randomly from different cold storages and 200 potatoes were tested to
identify the causal organisms. The study showed that the prevalence of the
diseases were Dry rot (3.66%), Brown rot (3.21%), Common scab (5.38%), Soft
rot (4.82%) and the prevalence of physiological disorder (5.17%). Five causal
organisms were identified namely Ralstonia solanacearum, Pectobacterium,
Pseudomonas sp, Streptomyces scabies and Fusarium spp. Bacteria were
identified by growing them on selective and semi selective media and conducting
different biochemical tests viz. KOH solubility, Gram’s staining, Catalase,
Oxidase, Levan production, Gelatin liquefaction, Starch hydrolysis, Potato soft
rotting and motility test.
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 (M.S.)
IN
PLANT PATHOLOGY
Semester: Jan-Jun, 2016
