Shirshedu Shil Trivedi
Protection of plants against herbivorous pests is an important aspect that guarantees agricultural efficiency, i.e., food provision to populations. Environmental, water and foodstuff pollution by toxic pesticides, along with climate changes, highlight the necessity to achieve intensive development of ecologically safe methods of insect-pest control. A laboratory experiment was conducted to evaluate the prospects of insecticidal bio efficacy in extracts of Garlic, Allium sativum (Lamiaceae) and sareefa, Annona reticulata (Annonaceae) against Bihar hairy caterpillar, Spilarctia obliqua Walk. (Lepidoptera: Arctiidae). Bualbs of Garlic, Allium sativum and unripe fruts of Annona reticulate were collected from Kanpur and extracted them through soxhlet apparatus using alcohol as solvent. From stock solution different concentrations (0.5, 1.0 and 2.0 per cent) are prepared and tested under ambient condition against 3rd intars caterpillar of Bihar hairy caterpillars, Spilarctia obliqua Linn. A. sativum Linn. Extract showed the highest toxicological compatibility followed by C. domesticus Vol. and C. monophylla Linn. Gave 64.16 per cent caterpillar mortality whereas in untreated control gave only 12.26% mortality to the larvae only and taken as unit.
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