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Life table of the parthenium beetle, Zygogramma bicolorata Pallister (Coleoptera: Chrysomelidae) in Bangalore, India

Published online by Cambridge University Press:  19 September 2011

K. P. Jayanth  and
Geetha Bali
K. P. Jayanth
Affiliation:
Division of Entomology and Nematology, Indian Institute of Horticultural Research, Hessaraghatta Lake Post, Bangalore 560 089, India
Geetha Bali
Affiliation:
Department of Zoology, Bangalore University, Bangalore 560 056, India
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Abstract

Time-specific life tables were constructed for the Mexican beetle, Zygogramma bicolorata Pallister (Coleoptera: Chrysomelidae), which is a promising biological control agent of the Neotropical weed, Parthenium hysterophorus L. (Asteraceae) in and around Bangalore, India. Infertility of eggs (46.00–71.10%) was found to be the key mortality factor, followed by death during the pupal stage (15.76–21.38%), as confirmed by key mortality factor analysis and construction of survivorship curves. No parasitoids or predators were recorded on this insect, while some of the dead pupae/pre-pupae (2.27–17.24%) were found to be infected by Metarhizium anisopliae (Metchnikoff) Sorokin. The high generation trend values (305.88–557.14), give an indication of the biotic potential of this insect, which was found to cause rapid defoliation of the weed under field conditions.

Résumé

Des tables de budget vital ont, été construites pour le coléoptère mexicaine, Zygogramma bicolorata Pallister (Coleoptera: Chrysomelidae), qui est un potential ravageur de l'adventice du Nouveau Monde, Parthenium hysterophorus L. (Asteraceae) à Bangalore et ses environs en Inde. L'infertilité des oeufs (46,00 à 71,00%) apparaît comme le facteur-clé mortalité, suivie par la mortalité au stade pupal (15,76–21,38%), fait qui a été confirmé par l'analyse du facteur de mortalité et des courbes de budget vital construites à cet effet. Ni les parasitoïdes ni les predateurs n'ont été enregistrés sur cet insecte, quoique certaines pupes/pre-pupes mortes (2,27–17,24 %) aient été trouvées porteuses de Metarhizium anisopliae (Metchnikoff). De fortes valeurs de l'Indice de la tendance de génération (305,88–557,24%) donnent une identification sur le potentiel biologique de cet insecte qui provoque une rapide défoliation des mauvaises herbes dans les conditions de terrain.

Keywords

Zygogramma bicolorataParthenium hysterophorusbiological controlweedlife tableMetarhizium anisopliaeZygogramma bicolorataParthenium hysterophoruslutte biologiqueadventicebudget vitalMetarhizium anisopliae
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 15 , Issue 1 , February 1994 , pp. 19 - 23
Copyright
Copyright © ICIPE 1994

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References

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