IITA Bibliography System: Recent submissions

Now showing items 1901-1920 of 8126

    • Synergistic relationship of bacterial blight and anthracnose disease pathogen in cassava multiple infection 

      Fokunang, C.N.; Dixon, A.G.O.; Ikotun, T. (2003)
      A study was conducted at the greenhouse of the international institute of Tropical Agriculture, Ibadan,Nigeria to investigate the synergistic relationship of xanthomonas campestris pv. Manihotics (causal agent of cassava bacteria blight CBB), and colletotrichum gloeosporiodes f.sp manihotics (causal agent of cassava anthracnose disease CAD), in cassava multiple infection. There were statistical differences(p<0.05) in the cassava genotype following sequential inoculation of the pathogens and ...

    • Beyond crop technology: the challenge for African rural development? 

      Ortiz, R.; Hartmann, P. (2003)

    • Challenges, opportunities and strategy for cassava subsector development in Nigeria 

      Ezedinma, C.I.; Kormawa, P.M.; Manyong, V.M.; Dixon, A.G.O. (2003)
      Nigeria has substantial economic potential in its agricultural sector. However, despite the importance of agriculture in terms of employment creation, its potential for contributing to economic growth is far from being fully exploited. The sector’s importance fluctuates with any rise and fall in oil revenue and has remained stagnant over the past ten years. The contribution of the manufacturing sector to the GDP declined over the same period. Inappropriate macroeconomic and sector policies perpetuated ...

    • Induction of germination in dormant yam (Dioscorea spp.) tubers with inhibitors of gibberellins 

      Shiwachi, H.; Ayankanmi, T.; Asiedu, R.; Onjo, M. (2003)
      A reliable means to induce sprouting in dormant seed tubers of yams (Dioscorea species) is required to enhance flexibility in planting date and rate of propagation of the crop. Experiments were conducted to assess the potential of two gibberellin inhibitors, Uniconazole-P and Prohexadione-calcium, to induce sprouting in tubers from three varieties ofD. rotundata and four ofD. alata. Uniconazole-P and Prohexadionecalcium shortened the period of dormancy in tubers of some varieties. In others, they ...

    • Effects of cassava genotype, climate, and the Bemisia tabaci vector population on the development of African cassava mosaic geminivirus (ACMV) 

      Abdullahi, I.; Atiri, G.I.; Dixon, A.G.O.; Winter, S.; Thottappilly, G. (2003)
      A survey was carried out in the 1996/97 and 1997/98 growing seasons on a field planted in three replicates with five clones of cassava at the International Institute of Tropical Agriculture, Ibadan, located in a transition forest, to determine the effects of cassava genotype and climate on the development of African cassava mosaic geminivirus (ACMV) and changes in the Bemisia tabaci population. Cassava genotype, climate and their interactions have significant

    • Cassava virus diseases in Africa 

      Legg, J.P.; Thresh, J.M. (2003)
      Cassava plays a key role in the food security of sub-Saharan Africa, but as a vegetatively propagated crop, it is particularly vulnerable to the effects of virus diseases and these therefore represent a major threat to the livelihoods of millions of Africans. Nine viruses have been isolated from African cassava, but only cassava mosaic geminiviruses (CMGs) and Cassava brown streak virus (CBSV) cause diseases of major economic signifi cance. In recent years, both CMGs and CBSV have come under ...

    • Evaluation de nouvelles varieties digname en Cote dIvoire: bilan de trois annees dexperience avec des genotypes ameliores par lIITA 

      Ettien, J.B.; Tschannen, A.B. (2003)
      Assessment of new yam varieties in Côte d’Ivoire : results of three experiments years with improved genotypes by IITA The most important food crop in the Ivory Coast, yam, is cultivated in a traditional system with low productivity. In order to suffice the needs of the growing population the introduction of new technologies increasing the production of yam is mandatory. One way suggested here is the introduction of new improved varieties. The aim of this project was to identify promising varieties ...

    • Amelioration de la production de ligname a travers la fertilisation minerale en zone de savene de Cote dIvoire 

      Soro, D.; Dao, D.; Carsky, R.J.; Asiedu, R.; Assa, A.; Girardin, O. (2003)
      Improving yam production by mineral fertilisation in the savanna zone of Cote d’Ivoire. Côte d’Ivoire is the second producer of yam after Nigeria with 2.8 millions tons produced per year. Though its farmers are still looking for ‘’virgin’’ soil to increase their yields. Mineral fertilization study led in the savanna zone has as objective to determine the response of local yams to mineral fertilizers. Thus, four local varieties (Bètè bètè, Gnan, Krenglè and Wacrou) are tested with two fertility ...

    • Explaining the Failure in Agricultural production in subSaharan Africa 

      Nkamleu, G.B.; Gockowski, J.; Kazianga, H. (2003)
      This paper examines changes in agricultural productivity in 10 Subsaharan countries. The relative performance of agricultural sector was gauged using data envelopment analysis. From a panel data set of the 10 countries which included the 28-year period 1972-1999, mathematical programming methods were used to measure Malmquist indexes of total factor productivity. It was found that, during that period, total factor productivity have experienced a negative evolution in sample countries. A decomposition ...

    • Advances in yam and cassava nematology research at IITA 

      Coyne, D.; Mudiope, J.; Hugues, B. (2003)
      Progress in pest management on cassava (Manihot esculenta) in Africa has witnessed remarkable achievements over recent years in the management of African cassava mosaic virus, cassava mealy bug, cassava green mite and overall germplasm improvement for yield improvements. From the scant information available, root-knot nematodes appear to pose potentially serious constraints to cassava production across Africa. Under heavy infection, 98 % yield losses have been reported and in a survey in Uganda, ...

    • Economic gains from maize research in West and Central Africa: an overview 

      Manyong, V.M.; Makinde, K.O.; Coulibaly, O. (2003)
      Agricultural research by national systems and international institutes has contributed to the increase in maize production and productivity in West and Central Africa (WCA) over the last three decades. This subregion accounted for about 43% of maize production in sub-Saharan Africa (SSA) from 1998-2000, compared with 17% 30 years ago (1968-1970). Yields improved by 41% from an average of 858 kg ha"' in 1970 to about 1210 kg ha"' in 2000. During the period under review, a large number of disease ...

    • The role of GIS in the development and targeting of maize germplasm to farmers in West and Central Africa 

      Menkir, A. (2003)
      Maize (Zea mays L) is cultivated under a broad range of climatic conditions in West and Central Africa (WCA). For the purpose of germplasm evaluation, maize researchers in the subregion loosely stratified the diverse environments into four agroecological zones based on their knowledge and experience rather than on quantitative studies involving climatic data. Recent advances in the development of digital spatial databases and geographic information systems (GIS) have provided unprecedented ...

    • Plant virology in subSaharan Africa: proceedings of a conference organized by IITA, 48 June 2001 

      Hughes, J.A.; Odu, B.O. (2003)
      The rice yellow mottle diseases is the main virus disease found on rice in Africa. It has been reported in all major rice producing zone of sub-saharan Africa (East,West,Central and Southern Africa and Madagascar). The disease incidence and accompanying yield losses could be high depending on the rice cultivars grown, the date of infection and type of rice.

    • Mycosphaerella leaf spot diseases of bananas: present status and outlook 

      Jacome, L.; Lepoivre, P.; Marin, D.; Ortiz, R.; Romero, R.; Escalant, J. (2003)

    • Biological control for increased agricultural productivity, poverty reduction and environmental protection in Africa 

      Neuenschwander, P.; Langewald, J.; Borgemeister, C.; James, B. (2003)

    • Biological control of Helicoverpa armigera in Africa 

      Cherry, A.; Cock, M.; van den Berg, H.; Kfir, R. (2003)

    • IPM of banana weevil in Africa with emphasis on microbial control 

      Gold, C.S.; Nankinga, C.; Niere, B.; Godonou, I. (2003)

    • Maize revolution in West and Central Africa: an overview 

      Fakorede, M.A.; Badu-Apraku, B.; Kamara, A.Y.; Menkir, A.; Ajala, S.O. (2003)
      Maize (Zea mays L.) is cultivated under a broad range of climatic conditions in West and Central Africa (WCA). Unfortunately, maize production is constrained by a host of abiotic and biotic stresses, including drought, low soil fertility, diseases, insect pests, and the parasitic weed Striga hermonthica. The stresses, which occur in all countries of WCA, are too formidable for individual national research programs to overcome. The West and Central Africa Collaborative Maize Research Network (WECAMAN) ...

    • Bridging the gap with the CGIAR systemwide program on integrated pest management. 

      James, B.; Neuenschwander, P.; Markham, R.; Anderson, P.; Braun, A.; Overholt, W.; Khan, Z.; Makkouk, K; Meredia, K.; Dokono, D.; Mota-Sanchez, D.; Emechebe, A. (2003)

    • The impact of IARC genetic improvement programmes on cassava 

      Johnson, N.L.; Manyong, V.M.; Dixon, A.G.O.; Pachico, D. (2003)