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Toxicity of prirmiphos-methyl and three essential oils, alone and in combination against <i>Callosobruchus maculatus</i> (Fab.)
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Toxicity of pirimiphos-methyl and three essential oils, viz. cardamom [Elettaria cardamomum (L.) Maton.], cinnamon (Cinnamomum aromaticum Nees) and clove [Syzygium aromaticum (L.) Merr. & Perry]; either singly or in mixture in different ratios were investigated on the cowpea weevil, Callosobruchus maculatus (F.) adults, through residual film bioassay. The LD50 of pirimiphos-methyl was 0.011 μg cm-2 and that of cardamom, cinnamon and clove oils were 20.68, 12.38 and 16.89 μg cm-2 respectively after 24 h post-treatment. Pirimiphos-methyl and tested essential oils were used as mixture of 1:1, 1:2, 1:5, 1:10 and 1:20 and the LD50 values were calculated. All essential oils when combined with pirimiphos-methyl proved to be antagonistic effect against C. maculatus adults except cardamom oil which offered synergistic effect at the 1:20 ratio with pirimiphos-methyl. Key words: pirimiphos-methyl; cardamom; cinnamon; clove; LD50; synergism. DOI: 10.3329/ujzru.v28i0.5277 Univ. j. zool. Rajshahi. Univ. Vol. 28, 2010 pp. 01-05
Bangladesh Journals Online (JOL)
Title: Toxicity of prirmiphos-methyl and three essential oils, alone and in combination against <i>Callosobruchus maculatus</i> (Fab.)
Description:
Toxicity of pirimiphos-methyl and three essential oils, viz.
cardamom [Elettaria cardamomum (L.
) Maton.
], cinnamon (Cinnamomum aromaticum Nees) and clove [Syzygium aromaticum (L.
) Merr.
& Perry]; either singly or in mixture in different ratios were investigated on the cowpea weevil, Callosobruchus maculatus (F.
) adults, through residual film bioassay.
The LD50 of pirimiphos-methyl was 0.
011 μg cm-2 and that of cardamom, cinnamon and clove oils were 20.
68, 12.
38 and 16.
89 μg cm-2 respectively after 24 h post-treatment.
Pirimiphos-methyl and tested essential oils were used as mixture of 1:1, 1:2, 1:5, 1:10 and 1:20 and the LD50 values were calculated.
All essential oils when combined with pirimiphos-methyl proved to be antagonistic effect against C.
maculatus adults except cardamom oil which offered synergistic effect at the 1:20 ratio with pirimiphos-methyl.
Key words: pirimiphos-methyl; cardamom; cinnamon; clove; LD50; synergism.
DOI: 10.
3329/ujzru.
v28i0.
5277 Univ.
j.
zool.
Rajshahi.
Univ.
Vol.
28, 2010 pp.
01-05.
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