Abstract:
Two experiments were conducted in the laboratory under the Department of
Entomology, Sher-e-Bangla Agricultural University, Dhaka, Bangladesh during the
period from September 2011 to February 2012 to find out the efficacy of some
promising botanicals and fumigants applied against rice weevil, Sitophilus oryzae
Linn. on stored rice. Under experiment where five botanicals along with one untreated
control were used viz. dried neem leaf powder @ 2.5 g/kg rice, dried bishkatali leaf
powder @ 2.5 g/kg rice, dried marigold leaf powder @ 2.5 g/kg rice, dried dholkolmi
leaf powder @ 2.5 g/kg rice, dried mahogany leaf powder @ 2.5 g/kg rice, and
untreated control. In experiment three fumigants along with untreated control
treatments were used viz. camphor @ 1 gm/kg rice, phostoxin tablet @ 200 mg/kg
rice, naphthalene @ 500 mg/kg rice and untreated control. Both the experiments were
laid out in Completely Randomized Design (CRD) with 4 replications. Among five
botanicals, the dried neem leaf powder @ 2.5 gm/kg rice reduced the highest percent
of grain infestation by number (65.81%) and weight (57.42%) over control during the
management of rice weevil, S. oryzae in storage than dried leaf powder of bishkatali,
marigold, dholkalmi and mahogany; whereas, the dried mahogany leaf powder
reduced showed the least performance in reducing the percent grain infestation by
number (32.14% and weight (26.76%) over control. Among three fumigants, camphor
@ 1 gm/kg rice reduced the highest percent ofgrain infestation by number (73.34%) and
weight (76.19%) over control than phostoxin tablet and naphthalene, where naphthalene
@ 500 mg/kg rice reduced the lowest percent of grain infestation by number (55.15%)
and weight (59.96%) over control. Irrespective of botanicals and fumigant based
management practices, all fumigants performed superior in terms of the reduction of
percent grain infestation and survibility of larvae and pupae of rice weevil than
botanicals, where camphor @ 1.0 gm/kg rice grains showed the best performance in
controlling rice weevil on rice in storage. Camphor is also acceptable for the
consumers in terms of environmental safety point and human health hazards free
measures applied against insect pests of stored products, because it is derived from
Cinnamonum camphora plant.
Description:
A thesis
Submitted to theDepartment of Entomology,Faculty of Agriculture,
Sher-e-Bangla Agricultural University,Dhaka
in partial fulfillment of the requirements
for the degree of
MASTER OF SCIENCE(MS)
IN
ENTOMOLOGY
SEMESTER:JANUARY-JUNE, 2011