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VOL. 9, ISSUE 3 (2024)
Ovicidal and toxicological potential of neem and Harad Extracts against Megacopta cribraria (F.) (Hemiptera: Heteroptera: Plataspidae)
Authors
Anjana Singha Naorem, Rubina Azmeera Begum, Santana Saikia, Anandita Buragohain
Abstract
Megacopta cribraria
is a pest of major concern in soybean-producing nations and to curb its
population build-up, use of cultural practices, resistant varieties, biological
control agents and synthetic insecticides are generally practiced. The present
study was undertaken to assess the ovicidal and toxicological potential of
NeemOz Gold formulations and crude harad extract against M. cribraria.
Treatment on the 1-day old egg batches with Neem formulation showed no hatching
in all the test concentrations whereas harad extract also inhibited egg
hatching but only at the highest two concentrations of 7.5% and 10%. Treatment
on the 3-day old egg batches showed dose-dependent inhibition of egg hatching
in both treatments. Neem formulation was much more effective in its ovicidal
potency as compared to harad extract and the potency of the extract was
also dependent on the age of the treated egg. The toxicity assay with neem at
the sub-lethal doses resulted in the development of several body deformities
along with the arrestment of moulting in some nymphs. Harad extract did
not result in any body deformities but was significantly toxic at higher concentrations.
A positive dose-dependent mortality was observed in both treatments. LC50
of neem and harad was 0.088% and 5.45% respectively, indicating higher
toxicity of neem as compared to harad. The present findings shows the
potential of these extracts as a valuable environment friendly tool for
managing M. cribraria infestations in the crop fields.
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Pages:79-86
How to cite this article:
Anjana Singha Naorem, Rubina Azmeera Begum, Santana Saikia, Anandita Buragohain "Ovicidal and toxicological potential of neem and <i>Harad</i> Extracts against <i>Megacopta cribraria </i>(F.) (Hemiptera: Heteroptera: Plataspidae)". International Journal of Entomology Research, Vol 9, Issue 3, 2024, Pages 79-86
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