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Vegetos- An International Journal of Plant Research
Year : 2005, Volume : 18, Issue : 1and2
First page : ( 43) Last page : ( 45)
Print ISSN : 0970-4078.

Insecticidal Potentialities of Ageratum conyzoides and Nerium indicum Leaves Extracts Against Epilachna 28-punctata (F.)

Saxena Ranjana, Sharma Anil K.

Pest & Parasite Research Lab-II, Department of Zoology, Bareilly College, Bareilly-243 001 (U.P.).

Abstract

In the present study, 1.0, 0.5, 0.2 and 0.1% petroleum ether leaves extracts ofAgeratum conyzoides (Goat weed) and Nerium indicum (Pink kaner) were evaluated on the Ist instar larvae ofEpilachna 28 punctata Fab. for its growth, larval mortality, developmental period and adult emergence. 1.0% leaves extracts of both A. conyzoides and N. indicum showed 100 and 94.44% larval mortality respectively till emergence. Whereas 0.2 and 0.1% ofA. conyzoidesextract had shown only 33.33% larval mortality and that of N. indicum extract exhibited only 22.22 and 16.67% mortality when compared to control (13.91%). 0.5% extract of A. conyzoides significantly increased the total developmental period (27.41 days) in contrast to control (22.76days) and reduced adult emergence (33.33%). This was found to be comparatively less effective with 0.2 and 0.1% concentrations. Their LC values had also been calculated. During the development of hadda beetle diapause condition and deformed adults had also been noticed.

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Keywords

Epilachna 28 punctataNerium indicumAgeratum conyzoides, Leaves extracts.

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