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Quantification of the relative importance of 12 uncultivated hosts of Heliothis virescens (Fabricius) using field data

Published online by Cambridge University Press:  19 September 2011

Guy J. Hallman
Guy J. Hallman
Affiliation:
ICA, Espinal, Tolima, Colombia
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Abstract

Field data of counts of eggs and larvae of Heliothis virescens (Fabricius) (Lepidoptera: Noctuidae) in 12 uncultivated plants in Tolima, Colombia, were used to conduct analyses of variance of the relative importance of the 12 for the insect. Analyses were based on the number of eggs and larvae found per terminal and per 5 g of terminal material of each host.

Regardless of the analysis, more eggs and larvae of H. virescens were found on Desmodium tortuosum (Sw) DC (Papilionaceae) than on the other 11 hosts. In general, more eggs were found on pubescent plants, especially those with glandular trichomes.

A relatively high ratio of larvae:eggs for Ipomea triloba L. (Convolvulaceae) was interpreted to mean that larvae of H. virescens migrated to this plant from eggs laid on other hosts.

The removal rate of eggs from seven hosts due to unknown reasons was estimated to differ between the seven.

Résumé

Le comptage des oeufs et des larves d'Heliothis virescens (Fabricius) (Lepidoptera: Noctuidae) sur 12 plantes non cultivées dans la province de Tolima, Colombie, a fermis de quantifier l'importance relative de celles-ci pour l'insecte. L'analyse s'est basée sur le nombre de larves et d'insectes rencontrés sur la partie terminale elle-même et sur 5 g de matiéré prélevéee sur celte derniére.

Le nombre d'oeufs et de larves s'est avéré plus élevé sur Desmodium tortuosum (Sw) DC (Papilionaceae) que sur les 11 autres hotes quelle que soit la méthode de prélevement utilisée. En général, les oeufs étaient présents en plus grand nombre sur les plantes pubescentes et plus particuliérement sur celles avec des trichomes glandulaires.

Un rapport relativement élevé larves/oeufs sur Ipomea triloba L. (Convolvulaceae) pourrait signifier que les larves de H. virescens ont migre apres avor passe le stade d'oeuf sur d'autres plantes.

Des differentes sant apparues entre les miveaux d'elimination des oeufs de sept hotes, due a des raisons inconnues.

Keywords

Heliothis virescensplant hostsglandular trichomes
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 5 , Issue 6 , December 1984 , pp. 465 - 468
Copyright
Copyright © ICIPE 1984

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References

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