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Ground-Dwelling Arthropods in Upland and Hydromorphic Rice in Côte d'Ivoire

Published online by Cambridge University Press:  19 September 2011

I. O. Oyediran ,
A. K. A. Traore  and
E. A. Heinrichs
I. O. Oyediran
Affiliation:
West Africa Rice Development Association (WARDA), 01 B.P. 2551 Bouaké, Côte d'Ivoire
A. K. A. Traore
Affiliation:
West Africa Rice Development Association (WARDA), 01 B.P. 2551 Bouaké, Côte d'Ivoire
E. A. Heinrichs
Affiliation:
West Africa Rice Development Association (WARDA), 01 B.P. 2551 Bouaké, Côte d'Ivoire
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Abstract

Pitfall-trap sampling was used to determine the activity (numbers collected as determined by locomotor activity and density) of epigaeic (soil-surface dwelling) arthropods in rice cultivated at various toposequence sites on the slope of an inland valley in Bouaké, Côte d'Ivoire, West Africa in 1994–1996. The major arthropod groups collected were ants, spiders, crickets, carabids and grasshoppers. Ants and spiders were the most active. Arthropod activity changed in response to crop growth stage with activity generally increasing towards harvest. Ant activity differed significantly between toposequence sites and was highest in the upper portion of the slope. The pattern for spider activity in relation to toposequence site varied among years. Agronomic practices that would enhance the populations of ground-dwelling predaceous arthropods are an important consideration when developing cultural practices for rice production on hillsides of inland valleys in West Africa.

Résumé

Un échantillonnage au moyen de pièges de Baber a été effectué dans des sites rizicoles situés à differents niveaux de toposéquence de la cuvette de Bouaké, Côte d'Ivoire en Afrique Occidentale et il visait la détermination de l'activité des arthropodes épigaéiques (fouillant la surface de sol), en riz cultivé. Les groupes principaux d'arthropodes collectées étaient constitués de fourmis, araignées, criquets, carabides et de sauterelles. Les fourmis et les araignées étaient les plus actifs. L'activité des arthropodes changeait suivant lest étapes de croissance de riz avec une activité maximale se situant vers l'époque de la moisson. L'activité des fourmis était significative dans les sites des différentes toposéquences et elle était prononcée dans la partie supérieure de la pente. L'activité des araignées par rapport aux toposéquences variat d'année en annee. Les practiques culturales visant la sauveguarde et l'augmentation des populations d'arthropodes prédateurs terricoles sont d'une grande importance lors du développement des méthodes culturales pour la riziculture conduite sur des pentes des cuvettes intérieures en Afrique Occidentale.

Keywords

Oryza sativaricePardosa injucundaWadicosa onckaspidersantscarabidsCôte d'IvoireWest AfricaOryza sativarizPardosa injucundaWadicosa onckaaraignéesfourmiscarabidesCôte d'IvoireAfrique de l'Ouest
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 20 , Issue 2 , June 2000 , pp. 81 - 90
Copyright
Copyright © ICIPE 2000

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