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EFFECT OF ETHANOLIC
PLANT EXTRACTS ON THREE STORAGE GRAIN PESTS OF
ECONOMIC IMPORTANCE
FARKHANDA MANZOOR1,
GHAZALA NASIM2*, SADIA SAIF1, SAADIYA ASMA MALIK1,
Abstract:
Screening
of plant extracts from wild species of plants for insecticidal
properties could lead to the discovery of new agents for pest control.
Keeping this in view, the ethanolic extracts of five plants leaves
Bakain (Melia azedarach), Mint (Mentha longifolia),
Habulas (Myrtus communis), Lemongrass (Cymbopogon
citratus) and Datura (Datura stramonium) were tested
against three stored grain pests viz.,
Oryzaephilus surinamensis
L.
(Saw-Toothed Grain Beetle),
Tribolium castaneum.
Herbst (Red
Flour Beetle) and Callosobruchus chinensis L. (Gram Dhora).
The results revealed that all of the tested materials had repellent and
lethal effects against the tested pests as compared to untreated check.
The extracts were mixed with grain 10mg/g of grains. Comparison of test
plant extracts on Oryzaephilus surinamensis
showed that Habulas extracts were the most effective causing 50.71%
mortality. Datura showed maximum mortality of (21.43%) in
Tribolium castaneum and when percentage mortality of different
plants extracts on Callosobruchus chinensis was compared, it was
seen that Habulas caused highest (63.94%) mortality. Present study also
revealed that all the treatments significantly deterred / repelled the
tested insects. Lemon grass showed maximum repellency of 39.75% against
Oryzaephilus surinamensis. Habulas
extract showed maximum repellency of 64.05% against Tribolium
castaneum and Datura extract showed maximum (31.67%) repellency
against Callosobruchus chinensis. The results of thin layer chromatography (TLC) also showed that two
components were detected in Lemon grass extract, four components in Mint
extract and two components in Habulas extract. From Datura and Bakain,
three components are detected respectively in the ethanol extractive.
1Department
of Zoology, Lahore College for Women University, Lahore.
2Institute
of Agricultural Sciences, University of the Punjab, Lahore-54590
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