Author(s): Alimul Islam and Nurul Islam*
Abstract
Abstract
Petroleum ether (Pet. ether), Chloroform (CHCl3) and Methanol
(CH3OH) extracts of the test plants Epipremnum aureum (Linden & Andre) G. S. Bunting and Aglaonema marantifolium (Schott.) have
been subjected to dose-mortality and repellent activity tests against three injurious
pests Tribolium castaneum (Hbst.), Sitophilus oryzae (L.) and Callosobruchus chinensis (L.) to comment
on the presence of toxic substance(s) in the test materials. In the dose
mortality investigation, Pet. ether extract of E. aureum gave the LD50 values 1.40, 1.21, 1.16, 1.10,
1.04, 0.96 and 0.84mg/cm2; Pet. ether extract of A. marantifolium gave 1.34, 1.19, 1.14,
1.12, 1.07, 1.03 and 1.02mg/cm2 against T. castaneum after 6, 12, 18, 24, 30, 36 and 42h of exposure
respectively. Against S. oryzae Pet.
ether extract of E. aureum gave the
LD50 values 1.73, 1.66, 1.32, 1.08, 1.00, 0.99 and 0.90mg/cm2
and the Pet. ether extract of A.
marantifolium gave 1.04, 0.91, 0.87, 0.83, 0.80, 0.78 and 0.77mg/cm2
after 6, 12, 18, 24, 30, 36 and 42h of exposure respectively. Against C. chinensis the Pet. ether extract of E. aureum gave LD50 values 2.95,
2.02, 2.01, 1.91, 1.82, 1.72 and 1.65mg/cm2; the CH3OH extract
of A. marantifolium gave 2.34, 2.15,
1.93, 1.86, 1.83, 1.82 and 1.81mg/cm2 after 6, 12, 18, 24, 30, 36
and 42h of exposure respectively. In repellency tests, the Pet. ether extract
of E. aureum found significant
repellent activity against T. castaneum
and C. chinensis at 5% level of
significance (P<0.05). The CHCl3 extract of E. aureum showed significant repellent activity against T. castaneum and C. chinensis at 1% level of significance (P<0.01) and at 5%
level of significance (P<0.05)
respectively. In addition to that, CHCl3 extract of A. marantifolium was found to show
significant repellent activity against the adult beetles of C. chinensis at 5% level of significance
(P<0.05).
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