AUTHOR(S)
S. Sharma1, A. Senrung and A.K. Singh*

ABSTRACT

Present studywas taken up to evaluate the toxic effect of methanol and hexane extracts ofneem

leaf againstdiamondback moth (DBM), Plutella xylostella. The toxic effect of the twoextracts

was evaluated atsix different concentrations, viz. 0.5%, 1%, 1.5%, 2%, 2.5% and 3%. Mortality

of larvae wassignificantly higher at even the lowest concentration of 0.5% (61.67%) as comparedto control (13.33%). Complete larval mortality with neem methanol extract (NME)was recorded at 3% concentration. Mortality during early larval stages was significantlyhigher as compared to control at all the NME concentrations, and more than 50%larvae died during first two larval stages at 3%, 2.5% and 2% NMEconcentrations. The mortality was mainly due to the failure to moultsuccessfully into next stage. 52.8% mortality was observed during intermoult.At 0.5% NME, 63.64% mortality was recorded during pupal-adult moult. Hexaneextract from neem leaves (NHE) had a significant lethal effect at 1.5%concentration and above as compared to control. Maximum mortality recorded withthis extract was 51.67% at 3% concentration. At 2.5% and 3% NHE concentrationssignificant mortality was recorded during early larval stages. The estimated LC50 calculated fortotal mortality for NME and NHE extracts were 0.61% and 3.95% respectively. Theresults suggest that extract from neem leaves may potentially be used for the managementof P. xylostella.

DOI
https://doi.org/10.57182/jbiopestic.7.0.99-105

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