Larvicidal activity of different solvent extracts from the seeds of Abrus precatorius (L.) against pod borer, Helicoverpa armigera (Hubner)
S Ramesh Babu, Prahlad Kumar Meena and Ramgopal Dudwal
The present study was conducted on solvent extracts of seeds from Abrus precatorius against Helicoverpa armigera. Significant weight reduction in the surviving larvae when they were fed with different concentrations of solvent extracts of seeds from Abrus precatorius when compared to untreated control. Despite continuous feeding with a normal diet, larvae fed on A. precatorius methanol 10% treatment failed to recover to the normal weight. After 9 days of the experiment, their maximum weights ranged from 0.021g+0.020 to 0.257 g+0.100 as compared to the control larvae (0.364 g+0.051). In all the treatments the larvicidal activity was directly proportional to the concentration of the extract. Amon the solvent extracts of A. precatorius seeds, at higher concentrations of 10% methanol extracts induced a significant decrease in larval weight and survival at 7th and 9th day. At 10% of methanol extracts, larvae could not gain sufficient weight and showed 100% larval mortality and gave the highest insecticidal activity when compared to other solvent extracts like ethyl acetate and hexane in which larvae could recovered after fed with control diet within two to three days. These results indicated that the methanol extracts from Abrus precatorius affects the survival of H. armigera.
S Ramesh Babu, Prahlad Kumar Meena, Ramgopal Dudwal. Larvicidal activity of different solvent extracts from the seeds of Abrus precatorius (L.) against pod borer, Helicoverpa armigera (Hubner). J Entomol Zool Stud 2018;6(2):496-499.