Biological Control Center for Africa

Cotonou, Benin

Biological Control Center for Africa

Cotonou, Benin
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Sezonlin M.,French National Center for Scientific Research | Sezonlin M.,University Paris - Sud | Sezonlin M.,University Abomey Calavi | Ndemah R.,African Insect Science for Food and Health | And 8 more authors.
Entomologia Experimentalis et Applicata | Year: 2012

The cereal stem borer Busseola fusca Fuller (Lepidoptera: Noctuidae) is a species endemic to sub-Saharan Africa. It is a major pest of maize and cultivated sorghum, the main cereal crops on the African mainland. Previous studies using mitochondrial markers revealed the presence of three clades of haplotypes (W, KI, KII) among B. fusca populations. Previous preliminary studies based on a few B. fusca individuals collected from three localities within the Guineo-Congolian rain forest in Cameroon demonstrated a matching with clade KII, a fairly surprising result because the putative centre of origin of that clade is located 3 000 km away in East Africa. To check this finding, 120 individuals of B. fusca covering several Cameroonian sites belonging to both Guineo-Congolian rain forest and Afromontane vegetation mosaics were collected. Comparison of cytochrome b sequences using the same marker revealed low mitochondrial diversity (h = 0.483 ± 0.054, π = 0.073 ± 0.061%). Moreover, molecular diversity in the Guineo-Congolian rain forest zone was lower than that in Afromontane vegetation, which is therefore thought to be the likely starting point for the colonization of other zones in Cameroon. The study showed a moderate but significant structuring between populations (Φ ST = 0.034, P<0.001) as well as within and among the two Cameroonian phytogeographical groups considered (Φ SC = 0.000 and Φ CT = 0.051, respectively, both P<0.001). Nested clade phylogeographic analysis indicated that all Cameroonian clades with significant geographical associations were interpreted as a phenomenon of contiguous range expansion. All results suggest that the Cameroonian population of B. fusca is relatively recent and originates from the recent geographical expansion of clade KII. © 2012 The Netherlands Entomological Society.

Anato F.M.,University Abomey Calavi | Wargui R.B.,University Abomey Calavi | Sinzogan A.A.C.,University Abomey Calavi | Offenberg J.,University of Aarhus | And 3 more authors.
Agricultural and Forest Entomology | Year: 2015

In Benin cashew plantations, yields and nut quality are lost mainly as a result of insect pests. In the present study, we investigated the effectiveness of the African weaver ant Oecophylla longinoda as a biocontrol agent against Beninese cashew pests. In a 2-year study, nut yield and quality were compared among: (i) trees with weaver ants O. longinoda; (ii) trees where weaver ants were sugar-fed; (iii) integrated pest management (IPM) trees with weaver ants combined with fruit fly bait spray; and (iv) control trees receiving no control measures. All treatments with ants showed significantly higher yields than the control, with the IPM treatment leading to the highest yield. Compared with the control trees, the ants, ant sugar-fed and the IPM trees produced 78%, 122% and 151% more nuts, respectively. Nuts produced on control trees were of a higher quality on average because they were less damaged by thrips (probably because the fruit fly bait worked as a contact poison on thrips); this was also the case for the IPM treatment. In absolute numbers, however, trees in ant treatments produced more first-quality nuts. To achieve a broader and effective control of both coreid bugs and thrips, a combination of weaver ants and supplementary compatible control measures is recommended. © 2015 The Royal Entomological Society.

N'Depo O.R.,Biosciences University Of Cocody | Hala N.F.,Center National Of Recherche Agronomique Cnra | Gnago A.,Institute National Polytechnique Houphouet Boigny INPHB Yamoussoukro | Allou K.,University Of Cocody | And 2 more authors.
European Journal of Scientific Research | Year: 2010

The fruit fly Bactrocera invadens, is a frightening mango pest and attacks other fruits in Côte-d'Ivoire. In order to bring up to date the parasitic card of the fruit flies and to count some plants hosts associated with this species, the trapping technique of fruit flies was used and applied in three agro ecological areas (South, Center and North zones). Also various fruits with our range are collected then dissected. The emerged adult flies are identified and the plants hosts are listed. On the whole, 23 species were identified with a large presence of the new species B. invadens as well in the traps (91,6 %) as in the fruits collected (69 %). The various plants from where are emerged B. invadens are detected and classified according to the botanical families. Thus a thorough knowledge on biology, ecology and plants hosts of this species, would be necessary for a durable control at the regional and world scale. © EuroJournals Publishing, Inc. 2010.

Vayssieres J.-F.,CIRAD - Agricultural Research for Development | Vayssieres J.-F.,Biological Control Center for Africa | Ouagoussounon I.,University of Benin | Adandonon A.,University of Benin | And 7 more authors.
Biocontrol Science and Technology | Year: 2015

Prey capture and food scavenging activities of Oecophylla longinoda were monitored through regular weekly samplings during two consecutive years (2009–2010) in a large mango orchard of the Borgou Department of Benin, West Africa, a main mango production area located in the Sudan agro-ecological zone. In both years, interspecific competition with other ants occurred mainly during the dry season (January to March) resulting in increased captures of Formicinae, Myrmicinae and Ponerinae. More prey was caught during the rainy season (end April to end October) than during the rest of the year, with Diptera and Coleoptera prey peaking in May and June, respectively, along with the mango season. As insect prey quickly decreased during November to December weaver ants increasingly collected seeds and plant debris. A total of 241 species of insects were captured including 61 species (25.3%) associated with mango and a few with cashew, among which 48 mango pest species (78.7% of species associated with mango tree). Only five species (2.1%) of beneficial insects were captured. It is concluded that the presence of O. longinoda colonies is beneficial to perennial tree cropping systems such as mango and cashew. © 2015 Taylor & Francis.

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