Abstract:
ABSTRACT
Rice appears to be the most important food crop, accounting for a quarter
of all calories consumed Rice blast is one of the most common significant
obstacles to rice cultivation in any rice growing region of the world. Field
survey on rice blast (Magnaporthe oryzae) was conducted in 30 field sites
of Sonatola upazila belong to Bogura District during boro season 20192020.
Blast incidence and severity ranged from 0-81.8% and 0-65%
respectively. The highest blast severity was recorded in Basmoti rice field
of Pakulla village under Pakulla Union. Twenty (20) isolates of
Magnaporthe oryzae was identified and morphologically characterized on
Water Agar (WA), Potato Dextrose Agar (PDA), Potato Sucrose agar
(PSA) and Oat Meal Agar (OMA). Radial mycelia growth rate of all
isolates ranged from 5.5 to 22.5, 7.5 to 77.2, 5.5 to 61.5 and 7.5 to 72.5 in
Water Agar (WA), Potato Dextrose Agar (PDA), Potato Sucrose agar
(PSA) and Oat Meal Agar (OMA) respectively. Most of the isolates were
blackish white in color, rough cottony surface structured and irregular
shaped. Mycelial growth of Magnaporthe oryzae isolates significantly
varied on different culture media.
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 (MS)
IN
PLANT PATHOLOGY
SEMESTER: JANUARY-JUNE, 2021
