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At least 631 records · Page 35Linked to original sources
PubMed1998

Blackfly control: what choices after onchocerciasis?

Blackflies are reappearing in areas of West Africa where they used to be controlled with insecticides because they were vectors of the parasite Onchocerca volvulus. Even though they no longer transmit onchocerciasis in these areas they can hinder optimal land use through their biting behaviour. The authors discuss the problems associated with resuming the use of insecticides to control the blackfly and recommend that ground treatment be restricted to areas where it is likely to be effective on a continuing basis. In communities lacking technical and financial resources the only alternative consists of individual protection through the use of repellents or protective clothing.

Africa, Western↗
PubMedDate not supplied

Multiresidue analysis of pesticides in fresh fruits and vegetables using procedures developed by the Florida Department of Agriculture and Consumer Services.

Improved quality and efficiency of pesticide residue analysis were achieved by examining all aspects of the laboratory process. In an effort to eliminate methylene chloride hazardous waste, an acetonitrile extraction method, originally developed by the California Department of Agriculture, was modified and adopted. Sample size and solvent consumption were reduced with the new method. Custom glassware racks and disposable supplies reduced overall analysis time. Gravity-fed, solid-phase extraction simplified sample preparation and provided cleaner extracts for gas chromatographic analyses. Modifications to the method were made to achieve the ruggedness needed to maintain quality objectives during routine analysis. Instrumental improvements, including new selective detectors, retention time locking, and mass spectrometry screening for all samples, provided the laboratory with efficient, reliable, and confirmed analytical results.

Acetonitriles↗
PubMed1977

[Water resources and health problems in developing countries].

The rapidly increasing use of water for agricultural and hydroelectric development in developing countries is causing serious health problems. These can be divided into two categories; the diseases whose transmission depends on water; and the changes in the life style of the population. We review briefly the principal health problems and analyze the principles to be followed in solving them, and the reasons of the success or failure of health programs. Among the topics we consider, are the development versus health, the collaboration of health service personnel with the rest of the personnel participating in water development schemes, the necessity of ensuring a multidisciplinary approach to the solutions of these health problems, the necessity of integration of the public health component within the administrative and budgetary levels and the coordination of public health measures with the development of project from the planning phase through the completion and maintenance phases, the purely medical aspects of the health problems involved appearing as being of secondary importance. Common sense, and the use of simple, cheap methods adapted to the local conditions, and applied focaly, provide better solutions than the sophisticated, more general and expensive approaches. The time and budget accorded for surveys and research, usually excessive, should be limited. It is necessary to adhere to a disciplined use of water. Ambitions and utopian dreams and strategies of disease eradication should, in general, give way to more limited, but accessible objectives, whose attainment would lead to a decrease of the clinical and socioeconomic gravity of the health problems to a "reasonable" level.

Adult↗
PubMed2000

Microsystems technology for remote monitoring and control in sustainable agricultural practices.

The future development of advanced sensor and microsystems technologies for use in agriculture is briefly discussed, within a general appraisal of the industrial requirements and the potential economic and ecological benefits to be derived from the employment of novel sensing systems in sustainable agricultural practices, such as precision farming. It is proposed that these technologies are potentially important monitoring tools for farmers and growers, and that a concerted programme of research and development is required to satisfy the future requirements of the agricultural industry.

Agriculture↗
PubMedDate not supplied

Effects of agricultural pesticides on humans, animals, and higher plants in developing countries.

Undesirable side effects that result from the indiscriminate use of agricultural pesticides in developing countries are widespread. This has captured the attention of health workers, governments, and environmental protection agencies. In fact, the potential health effects of long-term exposure to humans, animals, and higher plants are of great concern. This study examines the effects of agricultural pesticides on such living forms and explores modes of action, and presents strategies to minimize the deleterious effects of pesticides to living forms in developing countries.

Animals↗
PubMed2006

Tests of landscape influence: nest predation and brood parasitism in fragmented ecosystems.

The effects of landscape fragmentation on nest predation and brood parasitism, the two primary causes of avian reproductive failure, have been difficult to generalize across landscapes, yet few studies have clearly considered the context and spatial scale of fragmentation. Working in two river systems fragmented by agricultural and rural-housing development, we tracked nesting success and brood parasitism in > 2500 bird nests in 38 patches of deciduous riparian woodland. Patches on both river systems were embedded in one of two local contexts (buffered from agriculture by coniferous forest, or adjacent to agriculture), but the abundance of agriculture and human habitation within 1 km of each patch was highly variable. We examined evidence for three models of landscape effects on nest predation based on (1) the relative importance of generalist agricultural nest predators, (2) predators associated with the natural habitats typically removed by agricultural development, or (3) an additive combination of these two predator communities. We found strong support for an additive predation model in which landscape features affect nest predation differently at different spatial scales. Riparian habitat with forest buffers had higher nest predation rates than sites adjacent to agriculture, but nest predation also increased with increasing agriculture in the larger landscape surrounding each site. These results suggest that predators living in remnant woodland buffers, as well as generalist nest predators associated with agriculture, affect nest predation rates, but they appear to respond at different spatial scales. Brood parasitism, in contrast, was unrelated to agricultural abundance on the landscape, but showed a strong nonlinear relationship with farm and house density, indicating a critical point at which increased human habitat causes increased brood parasitism. Accurate predictions regarding landscape effects on nest predation and brood parasitism will require an increased appreciation of the multiple scales at which landscape components influence predator and parasite behavior.

Agriculture↗
PubMed1982

[Economic problems and contradictions in mineral fertilizer application for solving nutrition problems in the developing countries].

The optimum application of mineral fertilizers in the agriculture of the developing countries is inhibited by the monopolization of the mineral fertilizer industry in the capitalist economic world system and the numerous contradictions in the developing countries themselves. Thus it requires the full state sovereignty and economic independence of the developing countries, and the creation of such social conditions which enable the further extension and better utilization of the fertilizer capacities as well as the optimum fertilizer application. This means applying mineral fertilizers in the best possible way in order to ensure the nutrition of their own population and aiming at agrarian structures which promote mineral fertilization, restructuring the system of mineral fertilizer prices, and developing the mineral fertilizer service.

Developing Countries↗