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Chabi A.,Center du riz pour lAfrique AfricaRice | Oloukoi J.,Obafemi Awolowo University | Mama V.J.,Institute National des Recherches Agricoles du Benin | Kiepe P.,Center du riz pour lAfrique AfricaRice
Cahiers Agricultures | Year: 2010

In sub-Saharan Africa, inland valleys are types of agro-ecosystems suitable for rice cultivation and anti seasonal crops. These important resources have not been developed enough due to their extreme diversity and to the fact that their potentialities are remain poorly identified by scientists and the actors of development. The present research aimed at estimating the interest of an information system on inland valleys, using the Dassa-Zoumé area in the centre of Benin as the study area. The methodology adopted for the inventory of the inland valleys is based on the calculation of the new channel NDVI (Normalized Difference Vegetation Index) from the Landsat 7-ETM+ image of 2000 with a spatial resolution of 28.5 m and on the realization of the slope map generated from a DEM (Digital Elevation Model) of the area. A total of 181 inland valleys were identified with a total surface of 1,124 hectares. About 60 % of the valleys identified have an area comprised between 0 and 5 ha while less than 5% vary from 20 to 25 ha. The detection and inventory approach used in this study, and based essentially on the exploitation of a satellite image, shows a level of reliability that should be extended in the search of lowlands for agricultural perspectives. It facilitates savings in time in comparison to other approaches that would necessitate the surveying of all the inland valleys. Source

Togola A.,Center du riz pour lAfrique AfricaRice | Nwilene F.E.,Center du riz pour lAfrique AfricaRice | Chougourou D.C.,Ecole polytechnique dAbomey Calavi EPAC | Agunbiade T.,Center du riz pour lAfrique AfricaRice
Cahiers Agricultures | Year: 2010

The Angoumois grain moth, Sitotroga cerealella (Olivier) (Lepidoptera, Gelechiidae), is a major pest on several continents causing major damage to stocks of several cereals (rice, maize, sorghum etc.). This study aimed at analyzing the presence of S. cerealella in key sites of rice production in Benin and evaluating the level of the pest population and its damage to farmers' rice stocks. For this purpose, paddy rice samples were collected from 11 sites of peasant stockage. In addition, pheromone traps were placed in farmers' paddy fields to study infestations. The results showed that 70 % of the rice stocks were infested by S. cerealella, with average populations varying from 30 to 300 individuals per kg of paddy. In infested samples, the damage level ranged from 3% to 18 % of grains attacked for 2 to 4 months of storage. Pheromone trapping showed that 80 % of the rice fields were infested, with an average of 16 individuals captured per trap. The presence of this pest is thus confirmed on rice in Benin. This study also shows that important damage can be caused on stored rice as soon as the storage period reaches 3 to 4 months. © 2007 John Libbey Eurotext. Source

Togola A.,Center du riz pour lAfrique AfricaRice | Nwilene F.E.,Center du riz pour lAfrique AfricaRice | Agbaka A.,Ecole polytechnique dAbomey Calavi EPAC | Anato F.,Ecole polytechnique dAbomey Calavi EPAC | And 2 more authors.
Cahiers Agricultures | Year: 2010

In Benin, damage caused by stem borers are a threat to rice production. The present study aimed at evaluating farmer knowledge of these pests in order to find participative solutions for their monitoring and control in rural areas. An agronomic survey was carried out with 151 producers in the regions of Zou, Collines and Couffo where specimens of rice stem borers and samples of their damage were exhibited to farmers for identification. Field visits were also undertaken in order to observe farmer knowledge. The results recorded show that rice producers in Benin have good knowledge of the main rice stem borers such are Sesamia calamistis Hampson (Lepidopera : Noctuidae), Chilo zacconius Bleszynski (Lepidoptera : Pyralidae), Maliarpha separatella Ragonot (Lepidopera : Pyralidae) and Diopsis spp. (Diptera : Diopsidae). Damages caused by stem borers, such as white panicle and dead heart, are also very well recognized by the farmers. The proven knowledge of rice stem borers by farmers would allow agricultural services to take advantage of farmers' experience and knowledge by associating them in local diagnosis and pest control measures. © 2007 John Libbey Eurotext. Source

Seck P.A.,Center du riz pour lAfrique AfricaRice | Togola A.,Center du riz pour lAfrique AfricaRice | Toure A.,Center du riz pour lAfrique AfricaRice | Diagne A.,Center du riz pour lAfrique AfricaRice
Cahiers Agricultures | Year: 2013

Rice has become a priority crop for food security and political stability for the majority of African countries and particularly in West Africa. However, despite the various endeavours and the political will to develop the rice sector, so far local rice production still lags behind food consumption needs of the population in this region. This paper aims at identifying ways to boost rice production in West Africa. The paper reviews the state of rice cultivation in the region and proposes concrete policy measures to boost the rice sector in West Africa. Source

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