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Host stage selection and sex allocation behaviors by Anagyrus mangicola Noyes were studied in choice and no-choice experiments in the laboratory. All host instars of the mango mealybug (MM), Rastrococcus invadens Williams (Hem., Pseudococcidae), were parasitized. First instars were less often enc...


Bokonon-Ganta, A.H.Neuenschwander, P.Vanalphen, J.J.M.Vos, M.[Host stage selection and sex allocation by Anagyrus mangicola (Hymenoptera: encyrtidae), a parasitoid of the mango mealybug, Rastrococcus invadens (Homoptera: pseudococcidae)]Host stage selection and sex allocation by Anagyrus mangicola (Hymenoptera: encyrtidae), a parasitoid of the mango mealybug, Rastrococcus invadens (Homoptera: pseudococcidae)

Plant architecture and N fertilizer may limit the performance of intercropped maize (Zea mays L.) and cowpea [Vigna unguiculata (L.) Walpers] cultivars. This paper describes an experiment in which cultivars of maize and cowpea were intercropped and fertilized with varying rates of N. The cowpea c...


Ezumah, H.C.Nam, N.K.Walker, P.[Maize-cowpea intercropping as affected by nitrogen fertilization]Maize-cowpea intercropping as affected by nitrogen fertilization

Our study on soil N dynamics was conducted in the rainy season of 2005 and 2006. It focused on the effects of soil managements with sole and combined applications of mineral and organic fertilizers in the long-term experiment conducted since 1993 in the Niamey Center of the International Crop Res...


Suzuki, K.Matsunaga, R.Hayashi, K.Matsumoto, N.Tobita, S.Bationo, B. AndréOkada, K.[Effects of long-term application of mineral and organic fertilizers on dynamics of nitrogen pools in the sandy soil of the Sahel region, Niger]Effects of long-term application of mineral and organic fertilizers on dynamics of nitrogen pools in the sandy soil of the Sahel region, Niger

Fifteen cassava (Manihot esculentaCrantz) genotypes were grown at two field sites of Nigeria from 1994 to 1996 (Ibadan: 28±5°C, altitude 210 masl and Jos: 18±5°C, altitude of 1260 masl) to evaluate the use of chlorophyll fluorescence in screening for cold tolerance in cassava. At 12 months after ...


Togun, A.O.Akparobi, S.O.Ekanayake, I.J.[Field studies on chlorophyll a fluorescence for low temperature tolerance testing of cassava (Manihot esculenta Crantz)]Field studies on chlorophyll a fluorescence for low temperature tolerance testing of cassava (Manihot esculenta Crantz)

Systemin is a plant signal peptide hormone involved in the responses to wounding and insect damage in the Solanaceae family. It works in the same signaling pathway of jasmonic acid (JA) and enhances the expression of proteinase inhibitors. With the aim of studying a role for systemin in plant ant...


Bubici, G.Carluccio, A.V.Stavolone, L.Cillo, F.[Prosystemin overexpression induces transcriptional modifications of defense-related and receptor-like kinase genes and reduces the susceptibility to Cucumber mosaic virus and its satellite RNAs in transgenic tomato plants]Prosystemin overexpression induces transcriptional modifications of defense-related and receptor-like kinase genes and reduces the susceptibility to Cucumber mosaic virus and its satellite RNAs in transgenic tomato plants

Rice yellow mottle virus (RYMV) disease is a serious constraint to the cultivation of rice in Africa and selection for resistance is considered to be the most effective management strategy. The aim of this study was to characterize the resistance of Tog5307, a highly resistant accession belonging...


Pidon, H.Ghesquière, AlainChéron, S.Issaka, S.Hébrard, E.Sabot, F.Kolade, O.Silué, D.Albar, L.[Fine mapping of RYMV3: a new resistance gene to Rice yellow mottle virus from Oryza glaberrima]Fine mapping of RYMV3: a new resistance gene to Rice yellow mottle virus from Oryza glaberrima

The parasitoid Gyranusoidea tebygi Noyes was released in West Africa against the mango mealybug, Rastrococcus invadens Williams, a pest that invaded Africa in the early 1980s. The ability of G. tebygi to control the mango mealybug was assessed in mango trees using paired sleeve cages. In sleeve c...


Boavida, C.Neuenschwander, P.Herren, H.[Experimental assessment of the impact of the introduced parasitoid Gyranusoidea tebygi Noyes on the mango mealbug Rastrococcus invadens Williams, by physical exclusion]Experimental assessment of the impact of the introduced parasitoid Gyranusoidea tebygi Noyes on the mango mealbug Rastrococcus invadens Williams, by physical exclusion

With changes in weather patterns and intensifying anthropogenic water use, there is an increasing need for spatio-temporal information on water fluxes and stocks in river basins. The assortment of satellite-derived open-access information sources on rainfall (P) and land use/land cover (LULC) is ...


Simons, GijsBastiaanssen, Wim G.M.[Integrating Global Satellite-Derived Data Products as a Pre-Analysis for Hydrological Modelling Studies: A Case Study for the Red River Basin]Integrating Global Satellite-Derived Data Products as a Pre-Analysis for Hydrological Modelling Studies: A Case Study for the Red River Basin

When Urban Harvest began its sub-Saharan programme in 2002, scientists in the Consultative Group on International Agricultural Research (CGIAR) knew that crop-livestock interactions intensify with human population densities. However, little was known about the nature of these interactions at the ...


Lee-Smith, D.Karanja, N.Njenga, M.Dongmo, T.Prain, G.[Nutrient cycles in three African cities.]Nutrient cycles in three African cities.
Scurrah, M.Celis Gamboa, C.Chumbiauca, S.Salas, A.Visser, Richard G.F.[Hybridization between wild and cultivated potato species in the peruvian andes and biosafety implications for deployment of GM potatoes.]Hybridization between wild and cultivated potato species in the peruvian andes and biosafety implications for deployment of GM potatoes.

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