Abstract:
The experiment was conducted in the experimental field of Sher-e-Bangla
Agricultural University, Dhaka during the period from June to November
2009 to explore the resistance source(s) among different hybrid rice varieties
against major insect pests. The study was conducted in randomized complete
block design (RCBD) with three replications. Seven rice varieities were
evaluated in the present study, among them six hybrid varieties viz. Hira-2,
Taj-1, Aftaf-108, Krisan-2, Madhumati-2, Aloron and one check variety BR
11 popularly cultivated as HYV. The rice stem borer, rice hispa, rice bug, rice
leaf roller, rice green leaf hopper, short horned grasshopper, long horned
grasshopper were found as the major insect pests of rice and caused significant
damages on all rice varieties. The check variety BR 11 performed best against
all major insect pests among the varieties. The hybrid rice varity Hira-2 and
Krisan-2 performed better against stem borer whereas susceptible found
against rice hispa. Aloron found susceptible against stem borer followed by all
other insect pests except short horned grass hopper. Considering yield and
yield contributing characters, BR11 was superior to the others. The highest
yield (4.376 ton/ha) was produced by BR11, where the lowest (1.946 ton/ha)
was produced by Aftaf-108. Among hybrid varieties, the maximum yield
(2.561 ton/ha) was produced by Aloron that was second highest of all
varieties.
Description:
A Thesis
Submitted to the faculty of Agriculture
Sher-e-Bangla Agriculture University, Dhaka
in partial fulfillment of the requirements
for the degree of
MASTER OF SCIENCE (MS)
IN
ENTOMOLOGY
SEMESTER: JANUARY-JUNE, 2010