Evaluation of contact activities of leaf extracts from four plant species against Sitophilus zeamais Motschulsky (Coleoptera: Curculiondae)
Experiments were conducted in the Biotechnology Central Laboratory, the Biological Sciences Laboratory and the Animal House of the Department of Biological Sciences, Federal University of Agriculture, Abeokuta, Ogun State, Nigeria, to test the insecticidal effects of ethanolic and aqueous leaf e...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Pusat Sistematik Serangga, Fakulti Sains dan Teknologi, Universiti Kebangsaan Malaysia
2014
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| Online Access: | http://journalarticle.ukm.my/10957/ http://journalarticle.ukm.my/10957/ http://journalarticle.ukm.my/10957/1/11708-31817-1-SM.pdf |
| Summary: | Experiments were conducted in the Biotechnology Central Laboratory,
the Biological Sciences Laboratory and the Animal House of the
Department of Biological Sciences, Federal University of Agriculture,
Abeokuta, Ogun State, Nigeria, to test the insecticidal effects of
ethanolic and aqueous leaf extracts of Azadirachta indica,
Chromolaena odorata, Mallotus oppositifolius and Tithonia
diversifolia. Doses of 0.5ml, 1.0ml, 1.5ml, and 2.0ml of ethanolic
leaf extracts and dose of about 0.5ml, 1.0ml and 3.0ml of aqueous
extracts were applied to 20g of maize grains in which 5-13 adult
Sitophilus zeamais were released for adult mortality tests. The
results showed that the highest (100.00%) mortality of Sitophilus
zeamais was obtained when a dose of 1.5ml of Tithonia diversifolia
and 2.0ml of Chromolaena odorata, Mallotus oppositifolius and
Tithonia diversifolia was applied and the least (21.21%) mortality
was recorded from treatments of 0.5ml of Azadirachta indica, while
for aqueous extracts the highest mortality recorded was (21.66%)and the least (0.00%) mortality of adult Sitophilus zeamais. The
adult mortality of Sitophilus zeamais was non-significantly (P>0.05)
different between the ethanolic extracts used and aqueous extracts
used. The findings of this study also showed that ethanolic extracts
were more effective than aqueous extracts used and higher dose of
ethanolic leaf extracts of Chromolaena odorata, Mallotus
oppositifolius and Tithonia diversifolia were more effective in
protecting maize grains against Sitophilus zeamais infestation. It was
observed that stains were left on the grains applied with ethanol
extracts. Therefore, more research work is recommended on
providing a solution that ensures the removal of the stains left by the
extract on the grain. |
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