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Spatial distribution of eggs laid and pods bored by Adisura atkinsoni (Moore) (Noctuidae: Lepidoptera) in field bean

Published online by Cambridge University Press:  19 September 2011

P. N. Krishna Moorthy
Affiliation:
Indian Institute of Horticultural Research, Hessaraghatta Lake, Bangalore-560089, India
G. S. Prasada Rao
Affiliation:
Indian Institute of Horticultural Research, Hessaraghatta Lake, Bangalore-560089, India
G. C. Tewari
Affiliation:
Indian Institute of Horticultural Research, Hessaraghatta Lake, Bangalore-560089, India
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Abstract

Distribution patterns of the critical stages of the major pod borer, Adisura atkinsoni (Moore) of field bean were studied at Bangalore, India. Eggs of A. atkinsoni and the pods damaged by its caterpillar followed negative binomial distribution. Eggs were distributed mostly on tender pods and those on tender pods (<0.5 cm wide) were highly correlated with total number of eggs laid on the inflorescence. Flat bored pods of 0.6–1.5 cm width were highly correlated with total number of bored pods per inflorescence. Compared with matured bored pods, flat pods also had more borers inside. 69.23% of the matured bored pods were without borers. Hence it is suggested that the eggs on tender pods and borer damage on flat pods, should both be observed before control measures are initiated.

Résumé

Nous avons étudié à Bangalore des modèles de distribution des stades critiques de l'insecte perceur dit Adisura atkinsoni (Moore) qui ravage le plus les haricots de champs (Lablab purpureus). Les oeufs des insectes A. atkinsoni et les cosses détruites par les chenilles de ces insectes suivaient une distribution binomiale negative. Le rapport de la variance à la moyenne et les valeurs de K montraient également la tendance de ces insectes à se grouper. Les oeufs étaient distribués surtout sur les cosses tendres et le nombre d'oeufs déposés sur les cosses tendres (<0,5cm de largeur) était sensiblement correlé avec le nombre total des oeufs déposés sur l'inflorescence. Le nombre de cosses plates et percées de largeur de 0,6–1,5 cm était sensiblement correlé avec le nombre total de cosses percées pour chaque inflorescence. En comparaison avec les cosses mûres et percées, les cosses plates avaient plus des insectes perceurs à l'intérieur. 69,23% des cosses mûres percées étaient sans insectes perceurs. Nous suggérons done que l'on devrait observer les oeufs sur les cosses tendres ainsi que les dégâts causes par les insectes sur les cosses plates avant de commencer toutes mesures de contrôle.

Type
Research Articles
Copyright
Copyright © ICIPE 1986

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References

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