of various plant powders on rice weevil
oryzae Linn.) in stored wheat
Singh1*, D. K. Sharma2, S. Bhatia2 and A.
Entomology, Punjab Agricultural University, Ludhiana-141 004, India
Processing & Food Engineering, Punjab Agricultural University,
Ludhiana-141 004, India
Plant Pathology, Punjab Agricultural University, Ludhiana-141 004, India
Author E-mail: email@example.com
received : 10.04.2015
received : 21.12.2015
received : 23.06.2016
Accepted : 12.07.2016
Aim: Now-a-days usage
of chemical insecticides has become more restricted and creating many
environmental problems. Therefore, objective of the present study was to
evaluate the alternative control measures in form of botanicals against rice
weevil (Sitophilus oryzae L.) on stored wheat.
botanicals in powder form viz., neem leaf powder (NLP), neem kernel
powder (NKP), dharek leaf powder (DLP), dharek kernel powder
(DKP), castor leaf powder (CLP) and castor kernel powder (CKP)
each at the rate of 1.0, 1.5 and 2.0 % (w/w) were tested by directly mixing into
wheat grains against S. oryzae. An aliquot of 100g wheat sample was
used in each treatment for maximum of 3 replications. Three jars were also
kept for untreated control. Three jars of Deltamethrin 2.8 EC were also kept
as standard check. Five pairs of 1-2 week old adult insects (1:1 female to
male ratio) were released into each jar. The open tops of all the jars were
covered with muslin and kept inside BOD incubator at 27?1 ?C and
70?5 % R.H.
2.8 EC was highly effective as all the adult insects were died within 24
hours after their release. Among various powders, NKP at 2% was found best as
it showed minimum grain damage (3.84%), weight loss (1.15%) and adult
emergence (16.17), while maximum inhibition rate (92.58%) over the untreated
control with maximum grain damage (21.16%), weight loss (13.83%) and adult
emergence (157.58 adults). The NKP was followed by DKP, NLP, DLP, CKP and
CLP. Seed viability was not adversely affected by any of the plant powders
used in the studies.
study showed that 2% NKP the most effective compound over the other compounds
and untreated control, and it can be used as botanical against S. oryzae
in stored wheat.
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