Article Details

S. N. Das^*
Agricultural Training Centre / State Agricultural Management and Extension Training Institute, Ramakrishna Mission Ashrama, Narendrapur, Kolkata – 700 103, West Bengal

Soumyesh Mandal

Agricultural Training Centre / State Agricultural Management and Extension Training Institute, Ramakrishna Mission Ashrama, Narendrapur, Kolkata – 700 103, West Bengal

DOI: NIL

Keywords: Plant extracts, Toxicity, LC₅₀, Epilachna beetle

Abstract

Experiments were carried out to evaluate the toxicity of six botanicals viz. Custard apple, Oleander, Parashi, Neem, Ramtulsi and Marigold against epilachna beetle. The extracts from leaves and shoots were prepared by using methanol as a solvent. The results showed that extracts from all the six plants had direct toxic effect on epilachna beetle. LC₅₀ values of all six plant extracts were compared from 24 to 120 hours after treatment (HAT). Their order was found with respect to decreasing toxicity in the following way: Parashi (1.29705) > Ramtulsi (1.31635) > Custard apple (1.34735) > Marigold (1.85334) > Neem (2.40967) > Oleander (2.54763) and Ramtulsi (0.33442) > Custard apple (0.36948) = Oleander (0.36948) > Parashi (0.41420) > Neem (0.47818) > Marigold (0.62597) at 24 and 120 hours after treatment respectively.
Abbreviations: HAT – Hours After Treatment, LC₅₀ – Lethal Concentration

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