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Biology of the Legume Pod Borer, Maruca vitrata (Fabricius) and Its Damage to Pigeonpea and Adzuki bean

Published online by Cambridge University Press:  19 September 2011

H. C. Sharma  and
B. A. Franzmann
H. C. Sharma
Affiliation:
Queensland Department of Primary Industries, P.O. Box 102 Toowoomba, Queensland, Australia, P.O. Box 4350
B. A. Franzmann
Affiliation:
Queensland Department of Primary Industries, P.O. Box 102 Toowoomba, Queensland, Australia, P.O. Box 4350
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Abstract

The biology, insect density-yield loss relationships, genotype reactions, and consumption and utilisation of food by the legume pod borer, Maruca vitrata (Fabricius) on pigeonpea (Cajanus cajan) and Adzuki bean (Phaseolus angularis) were studied. Post-embryonic development was completed in 20.2 to 22.6 days. Grain yield in plants infested with 2 and 4 larvae was the same as that in uninfested controls, while plants infested with 8 and 16 larvae suffered between 50–68% grain yield loss in pigeonpea and 61–71% in Adzuki bean. Food consumption by third instars was highest on ICPL 90011. This genotype had the lowest approximate digestibility (AD) and efficiency of conversion of ingested food (ECI). The significance of these results in relation to economic damage thresholds is discussed.

Résumé

Une étudé a été menée sur la biologie, les relations entre la densité des insectes et la baisse de production, les réactions génotypiques, de même que la consommation et l'utilisation de la nourriture chez le foreur de gousse, Maruca vitrata (Fabricius) sur le pois cajan (Cajanus cajan) et le haricot Adzuki (Phaseolus angularis). La durée de développement post-embryonnaire était de 20, 0–22, 6 jours. Il n'y avait pa de différence de production de grains entre les plants infestés de 2 à 4 larves et les témoins. Par contre, l'infestation des plants avec 8 à 16 larves provoquait entre 50 et 60% de chute de production en grains. La consommation de nourriture par les larves du troisième stade était la plus élevée sur ICPL 90011. Ce génotype affichait une digestibilité approximative et une conversion effective de la nourriture ingérée, les plus basses. La portée de ces résultats en relation avec les seuils économiques de dégâts est exposée.

Keywords

pigeonpeaAdzuki beanlegume pod borerMaruca vitrataresistancefood utilisationdamage thresholdpois cajanhariЄot Adzukiforeur des gousses de légumineusesMaruca vitratarésistanceutilisation de la nourriture\seuil dés dégâts
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 20 , Issue 2 , June 2000 , pp. 99 - 108
Copyright
Copyright © ICIPE 2000

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