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Seasonal Abundance of Rice-Feeding Insects and Spiders in Continuously Cropped Lowland Rice in West Africa

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Abstract

A ‘rice garden’ with monthly plantings of rice was established in an irrigated lowland area in April 1993 and continued for 3 years. Populations of the most common insects, the stalk-eyed flies, Diopsis spp., and the green leafhoppers, Nephotettix spp., and spiders and stemborer damage varied distinctly in relation to month of transplanting. Arthropod populations also exhibited distinct patterns in relation to crop growth stage. Grain yields varied with month of transplanting but there was no distinct trend from one year to the next. This study indicated that continuous cropping of the same fields over a 3-year period did not result in a build-up of insect pests or a decline in grain yield.

Résumé

Un ‘jardin de riz’ avec des plantations mensuelles du riz a été aménagé dans une vallée intérieure irriguée en Avril 1993 et maintenu pendant une période de 3 ans. Les populations d’insectes les plus communs, les diopsideés (Diopsis spp.), les cicadelles vertes (Nephotettix spp.), les araignées ainsi que les dégâts causés par les foreurs de tige ont évalués en fonction du mois de répiquage. Les populations d’arthropodes également démontraient les tendances distinctes par rapport à l’étape de croissance du riz. Les rendements en grains ont varié selon le mois du répiquage mais sans tendance évidente d’une année à l’autre. Cette étude a démontré que la culture continue sur le même terrain pendant une période de trois ans n’a pas entrainé une augmentation des insectes nuisibles ou une baisse de rendement en grains.

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Correspondence to E. A. Heinrichs.

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Oyediran, I.O., Heinrichs, E.A. Seasonal Abundance of Rice-Feeding Insects and Spiders in Continuously Cropped Lowland Rice in West Africa. Int J Trop Insect Sci 19, 121–129 (1999). https://doi.org/10.1017/S1742758400019378

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  • DOI: https://doi.org/10.1017/S1742758400019378

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