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| Registros recuperados: 20 | |
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| Nieukerken, E.J. van; Geertsema, H.. |
| A grapevine leafminer found recently in table grape orchards and vineyards in the Paarl region (Western Cape, South Africa) is described as Holocacista capensis sp. n. It has also been found on native Rhoicissus digitata and bred on that species in the laboratory. It is closely related to Holocacista salutans (Meyrick, 1921), comb. n. (from Antispila), described from Durban in KwaZulu-Natal, but widespread in southern Africa and a native leafminer of various Vitaceae: Rhoicissus tomentosa, R. digitata, R. tridentata and Cissus cornifolia. Holocacista capensis has been found on Vitis vinifera both in Gauteng and Western Cape, the earliest record being from 1950 in Pretoria. The initial host shift from native Vitaceae to Vitis must have occurred much... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Host shift; Leafminers; Vitaceae; Viticulture; Table grapes; Rhoicissus; Cissus; DNA barcode; Genitalia; Holocacista; Antispilina; Antispila; Afrotropics; South Africa; Zimbabwe; India. |
| Ano: 2015 |
URL: http://www.repository.naturalis.nl/record/648754 |
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| Lynam, Timothy; Tropical Resource Ecology Program, University of Zimbabwe; tlynam@science.uz.ac.zw; Bousquet, Francois; CIRAD Tera; bousquet@cirad.fr; Le Page, Christophe; CIRAD Tera; lepage@cirad.fr; d'Aquino, P.; CIRAD Tera; daquino@telecomplus.sn; Barreteau, Olivier; Cemagref Division Irrigation; barreteau@montpellier.cemagref.fr; Chinembiri, Frank C; Agritex;; Mombeshora, Bright; ;. |
| Two case studies are presented in which models were used as focal tools in problems associated with common-pool resource management in developing countries. In the first case study, based in Zimbabwe, Bayesian or Belief Networks were used in a project designed to enhance the adaptive management capacity of a community in a semiarid rangeland system. In the second case study, based in Senegal, multi-agent systems models were used in the context of role plays to communicate research findings to a community, as well as to explore policies for improved management of rangelands and arable lands over which herders and farmers were in conflict. The paper provides examples of the use of computer-based modeling with stakeholders who had limited experience with... |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Adaptive management; Bayesian belief networks; Developing country; Dynamic modeling; Multi-agent systems; Participatory modeling; Semiarid rangeland; Senegal; Spidergrams; Zimbabwe. |
| Ano: 2002 |
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| Campbell, Bruce; Center for International Forestry Research (CIFOR); b.campbell@cgiar.org; Sayer, Jeffrey A; WWF (World Wildlife Fund); jsayer@wwfint.org; Frost, Peter; Institute of Environmental Studies; pfrost@compcentre.uz.ac.zw; Vermeulen, Sonja; International Institute for Environment and Development; sonja.vermeulen@iied.org; Cunningham, Tony; World Wildlife Fund/UNESCO/Kew People and Plants Initiative; peopleplants@bigpond.com; Prabhu, Ravi; CIFOR Regional Office; r.prabhu@cgiar.org. |
| Assessing the performance of management is central to natural resource management, in terms of improving the efficiency of interventions in an adaptive-learning cycle. This is not simple, given that such systems generally have multiple scales of interaction and response; high frequency of nonlinearity, uncertainty, and time lags; multiple stakeholders with contrasting objectives; and a high degree of context specificity. The importance of bounding the problem and preparing a conceptual model of the system is highlighted. We suggest that the capital assets approach to livelihoods may be an appropriate organizing principle for the selection of indicators of system performance. In this approach, five capital assets are recognized: physical, financial, social,... |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Capital assets; Conceptual models; Decision support; Livelihoods; Modeling; Multivariate statistics; Natural resource systems; Performance; Zimbabwe. |
| Ano: 2001 |
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| Langyintuo, Augustine S.; Setimela, Peter S.. |
| The publication describes outcomes of a study to assess the effectiveness of a large-scale crop seed relief effort in Zimbabwe during 2003-07. Aims of the effort, which was supported by the British Department for International Development (DfID) and coordinated by the Food and Agricultural Organization (FAO) regional office in Harare, included broader diffusion of open-pollinated maize varieties (OPVs), as opposed to hybrids. Based on the findings of the study, the authors recommend that, to increase benefits to vulnerable groups, participants in such efforts should effectively disseminate information on selecting and recycling seed, supported by training and field demonstrations, and should target relatively well-endowed farmers initially. Recommendations... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Agricultural development; Technical aid; Farm income; Food production; Maize; Open pollination; Hybrids; Zimbabwe; Crop Production/Industries; International Development. |
| Ano: 2007 |
URL: http://purl.umn.edu/7655 |
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| Maroyi,A; Rasethe,MT. |
| Documentation of use patterns of plants across national boundaries is of relevance in understanding the importance of plant resources to livelihood strategies of different ethnic groups. Plant resources have gained prominence as a natural asset through which families derive food, frewood, income, medicines and timber, enabling particularly poor communities to achieve self-suficiency. The objective of this study was to investigate the trends in plant usage in South Africa and Zimbabwe. An ethnobotanical investigation was conducted between January 2012 and January 2013 in the Limpopo Province, South Africa and the Midlands Province, Zimbabwe. The study used questionnaire surveys and interviews with a total of 143 participants to explore plant use patterns in... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ethnobotany; Plant use; Rural communities; South Africa; Zimbabwe. |
| Ano: 2015 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572015000200005 |
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| Bellon, Mauricio R.; Gambara, Peter; Gatsi, Tendai; MacHemedze, Timothy E.; Maminimini, Obert; Waddington, Stephen R.. |
| Soil infertility is a major constraint to food production in the communal areas of Zimbabwe. Smallholders in the region recognize the problems of low soil fertility and have devised ways of coping with them. This study describes the use of farmers taxonomies of themselves and their soils to identify and understand the options they have, and the constraints they face in managing poor soil fertility in Chihota, a sub-humid communal area of north central Zimbabwe. It is part of an effort by a group of agricultural researchers and extensionists working on improved soil fertility technologies, to better integrate their work with farmers in order to expose the latter to promising technologies, get feedback on the technologies merits and feasibility, and help... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Participatory methods; Soil fertility; Local taxonomies; Smallholders; Zimbabwe; Farm Management; Land Economics/Use. |
| Ano: 1999 |
URL: http://purl.umn.edu/7677 |
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| Zwaan, J.C.. |
| As one of the most valuable gemstones, emeralds are known to occur in several countries of the world, such as Colombia, Zambia, Brazil, Pakistan, Afghanistan, Russia, Madagascar and Zimbabwe. The emerald deposits at Sandawana, Zimbabwe, are described, the emeralds from this deposit characterised and a model of emerald formation presented; this is compared with existing models. The emeralds from Sandawana, Zimbabwe, show relatively constant physical properties, with high refractive indices and specific gravities. They are characterized by laths and fibres of amphibole, both actinolite and cummingtonite. Other common inclusions are albite and apatite. Rare, opaque and chromium-rich inclusions constitute a new variety of ilmenorutile. Compared to emeralds... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Emerald; Sandawana; Zimbabwe; Gemmology; Petrology; Geothermometry; Geochronology; 38.30. |
| Ano: 2006 |
URL: http://www.repository.naturalis.nl/record/209632 |
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| Meinzen-Dick, Ruth Suseela; Adato, Michelle; Haddad, Lawrence James; Hazell, Peter B.R.. |
| The extent to which agricultural research has reduced poverty has become an increasing concern of policymakers, donors, and researchers. Until recently, poverty reduction was a secondary goal of agricultural research. The primary focus was on increasing food supplies and reducing food prices, a strategy that was successful in increasing the yields of important food staples. When increased productivity is combined with increased agricultural employment, lower food prices, and increased off-farm employment, agricultural research can be credited with significant reductions in rural poverty. However, these benefits do not necessarily materialize, and thus it is essential to understand how agricultural technologies influence and are influenced by the diverse... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Poverty; Agricultural research; Sustainable livelihoods; Vulnerability; Agricultural extension; Bangladesh; China; India; Mexico; Kenya; Zimbabwe; Research and Development/Tech Change/Emerging Technologies. |
| Ano: 2003 |
URL: http://purl.umn.edu/16088 |
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| Tschirley, David L.; Poulton, Colin; Boughton, Duncan. |
| With cotton sector reform in much of SSA a decade old, it is now possible to review the empirical record and begin drawing lessons from experience. This paper assesses the record of five countries in southern and eastern Africa: Tanzania, Uganda, Zimbabwe, Zambia, and Mozambique. In four of these countries, cotton is the first- or second most important smallholder cash crop; only in Uganda does it substantially lag other cash crops. The focus on the course of reform in each – initial conditions, key elements of the reform, and institutional response to it – and attempt to draw lessons for policy makers, donors, and researchers. the paper begins by outlining the challenges faced by cotton production and marketing systems. Next a review the range of... |
| Tipo: Report |
Palavras-chave: Food security; Food policy; Cotton sector reform; Tanzania; Uganda; Zimbabwe; Zambia; Mozambique; Agricultural and Food Policy; Crop Production/Industries; Q18. |
| Ano: 2006 |
URL: http://purl.umn.edu/54477 |
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| MASVINGWE,C.; MAVENYENGWA,M.. |
| Major clinical signs were depression, vomiting, abdominal pain, weakness, recumbency, paddling convulsions terminating in death from 6 to 96 hours after ingestion. Gross pathological findings included ascites with fibrin strands, enlarged, congested and friable livers with accentuation of lobulation on the capsule. Microscopically, acute hepatic congestion and hemorrhage, centrilobular hepatocyte necrosis, with occasional binucleation together with discoid lysis of skeletal and cardiac muscle fibers were remarkable changes. Binucleation of hepatocytes and degenerative changes in active muscles have not been reported before in relation to cocklebur plant toxicosis. These findings suggest that X. strumarium is a potential cause of sudden death in pigs... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Xanthium strumarium toxicosis; Hepatocyte necrosis; Striated muscle fiber and renal tubular degeneration; Zimbabwe. |
| Ano: 1998 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0104-79301998000200003 |
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| Registros recuperados: 20 | |
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