caa a22 4500 388105658 CHVBK 20180307125336.0 cr unu---uuuuu 161130e199909 xx s 000 0 eng 10.1017/S1742758400019366 doi S1742758400019366 pii (NATIONALLICENCE)cambridge-10.1017/S1742758400019366 Abundance of Rice Arthropods and Weeds on the Continuum Toposequence in a West African Inland Valley [Elektronische Daten] A 2-year study was conducted to determine the abundance of rice arthropods as affected by weeding regimes and toposequence sites, from upland to lowland, in an inland valley in Côte d'Ivoire, West Africa. Toposequence site had an effect on insect populations. Most insects were found in the moist, lower portion of the slope (hydromorphic or phreatic zone) and in the valley bottom (irrigated lowland). Among these were the white leafhoppers Cofana spectra and C. unimaciilata (Hemiptera: Cicadellidae), the green leafhoppers Nephotettix spp. (Hemiptera: Cicadellidae), and the diopsids Diopsis longicornis and D. apicalis (Diptera: Diopsidae). Stemborer damage was generally most severe in the lowland ecology. Weed dry weights and weed species composition were affected by toposequence site. Cyperns difformis L. was most abundant in the lowland and Digitarla horizontalis Willd. in the upland sites. Weeding regime had an effect on the abundance of insect pests and natural enemies (spiders and damselflies) and on the extent of stemborer damage, the effect varying with toposequence site. Implications of the results for the integrated management of weeds and insects are discussed. Copyright © ICIPE 1999 Oryza sativa nationallicence rice nationallicence continuum toposequence nationallicence weeds nationallicence Diaperasticus spp nationallicence Cofana spp nationallicence Nephotettix spp nationallicence Stenocoris spp. damselflies nationallicence spiders nationallicence stemborers nationallicence Côte d'Ivoire nationallicence West Africa nationallicence Oryza sativa nationallicence continuum de toposéquence nationallicence adventices nationallicence Cofana spp nationallicence Diaperasticus spp. Cofana spp nationallicence Stenocoris spp nationallicence libellules nationallicence araignées nationallicence foreurs de tiges nationallicence Côte d'Ivoire nationallicence Afrique d l'Ouest nationallicence Oyediran I. O. West Africa Rice Development Association (WARDA), 01 B.P. 2551 Bouaké, Côte d'Ivoire Heinrichs E. A. Department of Entomology, University of Nebraska, Lincoln, NE, USA Johnson D. E. Natural Resources Institute, University of Greenwich, Chatham, Kent, UK International Journal of Tropical Insect Science Cambridge University Press 19/2-3(1999-09), 109-119 1742-7584 19:2-3<109 1999 19 JTI https://doi.org/10.1017/S1742758400019366 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1017/S1742758400019366 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Oyediran I. O. West Africa Rice Development Association (WARDA), 01 B.P. 2551 Bouaké, Côte d'Ivoire NATIONALLICENCE 700 1- Heinrichs E. A. Department of Entomology, University of Nebraska, Lincoln, NE, USA NATIONALLICENCE 700 1- Johnson D. E. Natural Resources Institute, University of Greenwich, Chatham, Kent, UK NATIONALLICENCE 773 0- International Journal of Tropical Insect Science Cambridge University Press 19/2-3(1999-09), 109-119 1742-7584 19:2-3<109 1999 19 JTI CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge