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Indian Journal of Entomology
Year : 2008, Volume : 70, Issue : 4
First page : ( 350) Last page : ( 355)
Print ISSN : 0367-8288.

Life table studies of Helicoverpa armigera (Hubner) on pigeonpea

Bisane K. D., Katole S. R.

Department of Entomology, Dr. Panjabrao Deshmukh Krishi Vidyapeeth, Akola.

Received:  October,  2008.

Abstract

Life tables for determining mortality factors of Helicoverpa armigera (Hubn.) on pigeonpea were prepared during 2004–05 and 2005–06. In the life table of absolute population of field collected life stages, egg non-viability was found to be 9.35%, whereas, smaller larvae was the most vulnerable stage as parasitoids accounted for it's 37.70% mortality. Highest parasitization 15.58% was recorded due to E. argenteopilosus followed by C. chlorideae (5.53%) and Bracon sp. (4.02%). In bigger and pre-pupal larvae, Tachinid fly caused 7.37 and 5.38% parasitization respectively. Besides, HaNPV disease contributed to 2.52 and 0.49% reduction of smaller and bigger larvae respectively. Pupal suppression was 30.0% on pigeonpea, where Tachinid fly resulted in the highest mortality of 12.73%. Life table from field collected eggs revealed the highest mortality 13.47% in egg stage on pigeonpea and artificial diet. Similarly in laboratory cultured eggs on pigeonpea and artificial diet, egg stage showed maximum population reduction of 10.19 and 10.94%, respectively followed by the first instar larvae and pupal stage. The maximum generation survival of H. armigera was more on artificial diet than the pigeonpea.

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Key words

Helicoverpa armigera, pigeonpea, life table, mortality factors, parasitization.

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