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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.

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.

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