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The defoliating beetle Mesoplatys ochroptera Stål (Coleoptera: Chrysomelidae) has become a serious pest of the tropical legume Sesbania sesban (L.) Merrill in agroforestry systems in eastern and southern African countries. In this study, 32 accessions of Sesbania spp. collected from eastern and southern Africa were screened for resistance to M. ochroptera at Msekera, Zambia. Two mechanisms of resistance - antixenosis and antibiosis - were indicated in the different accessions. Accessions of Sesbania bispinosa, S. leptocarpa and S. macrantha were found to be more preferred by the insect compared to S. sesban and S. rostrata accessions. Preference of accessions was negatively correlated with leaf-hair density and positively correlated with the number of leaves per seedling and plant height. Under the conditions of eastern Zambia, some accessions of S. sesban from Kenya, Malawi and Ethiopia were found to be comparable to the Zambian accessions in survival, growth and biomass production. Four accessions of S. sesban - Kakamega (ex Kibwezi) and Kisii 2 from Kenya, Zwai 090 from Ethiopia and Rumphi from Malawi - appeared to compensate well for M. ochroptera damage. RÉSUMÉ Le scarabée défoliateur Mesoplatys ochroptera Stal(Coleoptera ; Chrysomelidae) est devenu un sérieux ravageur de la légumineuse tropicale Sesbania sesban (L.) Merill dans les systèmes agroforestiers des pays d'Afrique de l'Est et du Sud-est. Dans cette étude 31 lots de Sesbania spp.récoltés en Afrique de l'Est et du Sud-est ont été criblés pour leur résistance à M. ochroptera à Msekera, en Zambie. Deux mécanismes de résistance, l'antixénose et l'antibiose, ont été évalués dans les différents lots. Les lots de Sesbania bispinosa, S. leptocarpa et S. macrantha sont plus appréciés par les insectes que les lots de S. sesban et S. rostran. La préférence des lots est corrélée négativement avec la densité de poils des feuilles et positivement avec le nombre de feuilles par plantules et la hauteur de ces dernières. Dans les conditions de l'Est de la Zambiecertains lotsde S. sesban du Kenya, du Malawi et d'Ethiopie sont comparables aux lots de la Zambie pour la survie, la croissance et la production de biomasse. Quatre lots de S. sesban : Kakamega (ex Kibwezi) et Kisii 2 du Kenya, Zwai 090 d'Ethiopie et Rumphi du Malawi semblent bien compenser les dé gâts de M. ochroptera. |
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http://hdl.handle.net/1807/176 |
| Publisher |
International Centre for Insect Physiology and Ecology (ICIPE), Kenya
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| Repository |
T-Space at The University of Toronto Libraries (Canada) |
| Keywords |
Mesoplatys ochroptera, Sesbania spp., resistance, antibiosis, antixenosis, Zambia Mesoplatys ochroptera, Sesbania spp., résistance, antbiose, antixénose, Zambie,
Zoology
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| Type |
Journal (Paginated),
Yes
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| Language |
Englisch
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| Relation |
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