خيارات البحث
النتائج 1991 - 2000 من 2,098
Improving citrus production in Surinam through control of citrus tristeza and citrus exocortis viruses
1987
Klas, J.E. (Agricultural Experiment Station, Paramaribo (Suriname))
Of the citrus diseases occurring in Surinam, fungal, bacterial, viral and those caused by nematodes, tristeza is most important. Trials to identify the best rootstocks to replace the tristeza-susceptible sour orange found Rangpur lime budded with nucellar Alidjan orange best on heavy clay soils. Sunki and King (tangors) are good rootstocks for grapefruit varieties. Research showed tristeza virus transmission by the aphid vector Toxoptera citricidus to be bi-modal (non-persistent and semi-persistent) in Surinam, with the latter more common
اظهر المزيد [+] اقل [-]Virus diseases of bananas: methods for early detection and characterization of bunchy top associated virus
1987
Iskra, M.L. | Bove, J.M. (Centre de Cooperation International en Recherche Agronomique pour le Developpement, Montpellier (France). Institut de Recherches sur les Fruits et Agrumes)
Describes a purification method for the Bunchy top virus based on density gradient centrifugation which allowed observation of the virus particles for the first time. Thirty micrograms of virus were obtained from 200g of infected leaves. To obtain large amounts of virus for antisera preparation the purification procedure has to be improved
اظهر المزيد [+] اقل [-]Producing disease-free citrus plants: the Corsican experience
1987
Vanniere, H. (Institut de Recherches sur les Fruits et Agrumes, San Nicolao (France))
Indexing, the ELISA test, Spiroplasma citri culturing, nucellar selection and shoot tip grafting are procedures used in Corsica to maintain virus-free budwood. Corsica has managed to remain free of the major diseases of citrus: Tristeza, Phoma tracheiphila (mal secco), Spiroplasma citri (stubborn) greening and Xanthomonas citri (citrus canker)
اظهر المزيد [+] اقل [-]Improving banana phytosanitation and banana production through shoot tip culture
1987
Ganry, J. (Centre de Cooperation International en Recherche Agronomique pour le Developpement, Montpellier (France). Institut de Recherches sur les Fruits et Agrumes)
The advantages of shoot tip planting material in banana production are briefly outlined. The production scheme and ongoing research at IRFA/Vitropic are summarised
اظهر المزيد [+] اقل [-]Improved citrus production through improved phytosanitation in Belize
1987
Garcia, F.P. (Citrus Growers' Association, Dangria (Belize))
Describes the phytosanitary measures in force and those that are planned. These include provision of virus-free registered mother trees to nurseries, registration of citrus nurseries, regulation of seed and imports, and inspection of farms and nurseries
اظهر المزيد [+] اقل [-]Production of virus-free citrus materials: the California experience
1987
Reuther, W. (California University, Riverside (USA))
Outlines the history and objectives of the California Citrus Clonal Protection Program (CCPP) which conducts research and is a primary source of disease-free budwood of desirable true-to-type citrus scion and rootstock varieties designed to exclude graft transmissible diseases (virus and virus-like)
اظهر المزيد [+] اقل [-]Biology of Mycosphaerella (Sigatoka): preliminary tests for the selection of resistant varieties
1987
Mourichon, X. (Centre de Cooperation International en Recherche Agronomique pour le Developpement, Montpellier (France). Institut de Recherches sur les Fruits et Agrumes)
Research is directed towards study of host-parasite relations. The 3 Sigatoka leaf spot pathogens, Mycosphaerella musicola (Yellow Sigatoka), M. fijiensis (Black Leaf Streak) and M. fijiensis difformis are compared morphologically and pathogenically. Species identification by electrophoresis on acrylamide gels has been studied, the species also differ in host range, geographical range, symptoms and distribution of lesions. Early tests of susceptibility of plantlets from meristem culture suggest that they react to infection in the same way as observed in the field
اظهر المزيد [+] اقل [-]Spreading mechanism, epidemiology and susceptibility test of Black Sigatoka and Sigatoka diseases
1987
Lehmann-Danzinger, H. (Goettingen Univ. (Germany, F.R.). Institut fur Pflanzenpathologie und Pflanzenschutz)
The leaf spot diseases of bananas and plantains, Sigatoka and Black Sigatoka, caused by Mycosphaerella musicola and M. fijiensis var. difformis are distributed worldwide and only in Central America respectively. Epidemiological studies are described in detail including seventy of the pathogens at different sites and correlation with climatic data. Susceptibilities of different banana and plantain genomic groups were found to be nearly identical for both diseases except that Black Sigatoka is more virulent so that both pathogens occupy the same ecological niche. A method developed to test the susceptibility of musa clones to Black Sigatoka using plantlets derived from shoot tip culture is described
اظهر المزيد [+] اقل [-]An overview of major pests of citrus in the Commonwealth Caribbean
1987
Reid, J.C. (Caribbean Agricultural Research and Development Institute, Mona (Jamaica))
Pests of major economic significance, their distribution in the Commonwealth Caribbean, the damage they cause and practices for their control are tabulated. The types of pests discussed are defoliators and foliage sap feeders and those causing damage to fruit, fiddler beetles, fruit flies, scale insects, and fruit piercing moths. The potentially serious pests of quarantine significance are summarised with their worldwide distribution and host plants other than citrus. The Mediterranean fruit fly Ceratitis capitata and the aphid vector of Tristeza, Toxoptera citricidus are significant
اظهر المزيد [+] اقل [-]Commercial implications of poor fruit quality due to poor phytosanitation of bananas with special reference to the Windward Islands
1987
Borton, C.A. (Windward Islands Banana Growers' Association, Castries (St. Lucia). Research and Development Division)
Poor phytosanitation affects banana quality through physical defects, harbouring of pests and diseases. The implications on marketing are briefly discussed
اظهر المزيد [+] اقل [-]