Meherun Nesa | University of Rajshahi, Bangladesh (original) (raw)

Papers by Meherun Nesa

The insecticidal activity, insect repellency and brine shrimp lethality tests of Petroleum ether ... more The insecticidal activity, insect repellency and brine shrimp lethality tests of Petroleum ether (Pet. ether), CHCl3 and CH3OH extracts of Hyptis suaveolens L. (Poit.) were assessed against Tribolium castaneum (Herbst) adults and Artemia salina L. nauplii under laboratory conditions. Pet. ether and CH3OH extracts of leaves offered mortality to the test beetles and gave LD50 values 4.322, 3.487, 2.653, 2.647 and 2.647mg cm-2, and 5.587, 4.122, 3.269, 3.075 and 2.727 mg cm-2 both after 12, 24, 36, 48 and 60h of exposure; and the CHCl3 extract of roots gave LD50 values 6.494 and 5.311mg cm-2 after 48 and 60h of exposure respectively. The Pet. ether, CHCl3 and CH3OH extracts of stem and the CH3OH extracts of root showed repellency at 5% level (p

Journal of Life and Earth Science, 2012

Dose-mortality and repellent activity tests of the chloroform extracts of fruit, leaf, root and s... more Dose-mortality and repellent activity tests of the chloroform extracts of fruit, leaf, root and stem of Solanum ferox L. against the redflour beetle Tribolium castaneum (Herbst) adults have been done. The fruit, leaf and stem extracts offered promising toxicity to the beetles within30 min. of exposure. The LD50 values for 30 min., 12, 24, 36 and 48h of exposures were 0.440, 0.247, 0.211, 0.207 and 0.164mg cm-2respectively for the fruit extract; 2.394, 1.712, 1.540, 1.239 and 0.993mg cm-2 respectively for the leaf extract; and 4.918, 0.871, 0.546, 0.472and 0.522mg cm-2 respectively for the stem extract. However, the root extract did not offer any mortality for 30 min. and 12h of exposure; and thus the LD50 values for 24, 36 and 48h of exposure were 6.667, 5.086 and 3.357mg cm-2 respectively. While the dose-mortality activity can bearranged in the order of fruit> leaf> stem> root extracts. The fruit and stem extracts showed repellent activity against T. castaneum adults atP<0.01 and the leaf extract at P<0.05 level of significance, while the root extract did not show any repellency.

The insecticidal activity, insect repellency and brine shrimp lethality tests of Petroleum ether ... more The insecticidal activity, insect repellency and brine shrimp lethality tests of Petroleum ether (Pet. ether), CHCl3 and CH3OH extracts of Hyptis suaveolens L. (Poit.) were assessed against Tribolium castaneum (Herbst) adults and Artemia salina L. nauplii under laboratory conditions. Pet. ether and CH3OH extracts of leaves offered mortality to the test beetles and gave LD50 values 4.322, 3.487, 2.653, 2.647 and 2.647mg cm-2, and 5.587, 4.122, 3.269, 3.075 and 2.727 mg cm-2 both after 12, 24, 36, 48 and 60h of exposure; and the CHCl3 extract of roots gave LD50 values 6.494 and 5.311mg cm-2 after 48 and 60h of exposure respectively. The Pet. ether, CHCl3 and CH3OH extracts of stem and the CH3OH extracts of root showed repellency at 5% level (p

Journal of Life and Earth Science, 2012

Dose-mortality and repellent activity tests of the chloroform extracts of fruit, leaf, root and s... more Dose-mortality and repellent activity tests of the chloroform extracts of fruit, leaf, root and stem of Solanum ferox L. against the redflour beetle Tribolium castaneum (Herbst) adults have been done. The fruit, leaf and stem extracts offered promising toxicity to the beetles within30 min. of exposure. The LD50 values for 30 min., 12, 24, 36 and 48h of exposures were 0.440, 0.247, 0.211, 0.207 and 0.164mg cm-2respectively for the fruit extract; 2.394, 1.712, 1.540, 1.239 and 0.993mg cm-2 respectively for the leaf extract; and 4.918, 0.871, 0.546, 0.472and 0.522mg cm-2 respectively for the stem extract. However, the root extract did not offer any mortality for 30 min. and 12h of exposure; and thus the LD50 values for 24, 36 and 48h of exposure were 6.667, 5.086 and 3.357mg cm-2 respectively. While the dose-mortality activity can bearranged in the order of fruit> leaf> stem> root extracts. The fruit and stem extracts showed repellent activity against T. castaneum adults atP<0.01 and the leaf extract at P<0.05 level of significance, while the root extract did not show any repellency.