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Life Tables for American Bollworm, Heliothis Armigera Hubner on Four Species of Cotton Under Field Conditions

  • R. Nanthagopal
  • S. Uthamasamy
Research Article

Abstract

Life table studies of American bollworm Heliothis Armigera Hubner on four species of cotton revealed that maximum mortality in the population occurred early in the life cycle. Prédation and dispersal accounted for maximum mortality of early instars, whereas migration and unknown reasons accounted for maximum mortality of late instars. Considering the life tables on four varieties of cotton, the loss of population during the first instar was significantly high in K8 and TKHe 44 whereas in Suvin and MCU 9 the loss was less.

Key Words

Life table mortality cohort survivorship prédation dispersal 

Résumé

Les etudes de la table du vie des vers cotoniers Heliothis armigera Hubner sur les quatre espèces de coton comune par example Gossypium barbadense (Suvin), G. hirsutum (MCU 9), G. herbaceum (TKHe 44) et G. arboreum (K 8) révèlent que la mortalité’ maximum de la population apparaissait daus les premieres étapes du cycle de la vie. La prédation et la dispersion étaient les causes de la mortalite’ maximum daus les premiere étapes, tandis que la migration et des raisons non-connues étaient responsables pour la mortalité’ maximum daus les dermiere etapes. Tenant compte de ces tables de vie sur quatre varietis de coton, la diminution de la population pendant la premiere etape etait grande, d’une facon significatine daus K 8 et TKHe 44 tandis que daus Suvin et MCU 9 la diminution etait pen elevee.

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Copyright information

© ICIPE 1989

Authors and Affiliations

  • R. Nanthagopal
    • 1
  • S. Uthamasamy
    • 1
  1. 1.Department of Agricultural EntomologyTamil Nadu Agricultural UniversityCoimbatoreIndia

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