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Influence of the chickpea cropping system onHelicoverpa armigera (Lep.: noctuidae) populations and their rate of parasitism byCampoletis chlorideae (Hym.: ichneumonidae)

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Abstract

The effect of intercropping chickpea with coriander or linseed onHelicoverpa armigera Hübner egg and larval populations and on the rate of larval parasitism was examined. There were significantly moreH. armigera larvae per plot in the sole chickpea treatment than in the intercropped treatments. The reduction was not the result of a negative effect of the companion crops on the numbers of larvae attacking chickpea. Larval density on chickpea was higher in the intercropped plots than the plots of sole chickpea.

The presence of the flowering companion crops did not result in either the attraction of otherwise uncommon parasitoids to the crop or an increase in the proportion ofH. armigera larvae parasitized byCampoletis chlorideae Uchida.

The results suggest that chickpea is a more suitable host forH. armigera than coriander or linseed, and that the reduction in the density ofH. armigera larvae in the intercroped treatments was due to the lower number of chickpea plants in these treatments.

Résumé

Cet article examine l'effet de l'association pois chiche/coriandre ou pois chiche/lin sur la présence des œufs et de populations larvaires de,Helicoverpa armigera Hübner, ainsi que sur le taux de parasitisme des larves. Le nombre de larves deH. armigera par parcelle est significativement plus élevé sur pois chiche en monoculture qu'en association. Cette différence ne peut être attribuée à l'effet négatif des associations sur le nombre de larves qui s'attaquent au pois chiche. La densité larvaire sur le pois chiche est plus élevée dans les associations que dans les parcelles de pois chiche en monoculture.

La présence de la culture associée en floraison n'a produit ni l'attraction d'autres parasitoïdes normalement peu présents dans la culture, ni une augmentation de la proportion de larves deH. armigera parasitées parCampoletis chloridae Uchida.

Les résultats laissent penser que le pois chiche est un hôte plus favorable pourH. armigera que le coriandre ou le lin et que la réduction du nombre de larves deH. armigera dans les parcelles en associations est due au nombre plus réduit de pois chiche dans ces traitements.

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  1. International Crops Research Institute for the Semi-Arid Tropics, 502 324, Patancheru, Andhra Pradesh, India

    S. E. Cowgill

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  1. S. E. Cowgill
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Cowgill, S.E. Influence of the chickpea cropping system onHelicoverpa armigera (Lep.: noctuidae) populations and their rate of parasitism byCampoletis chlorideae (Hym.: ichneumonidae). Entomophaga 40, 307–315 (1995). https://doi.org/10.1007/BF02373717

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  • DOI: https://doi.org/10.1007/BF02373717

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