Laboratory and Field Studies of Resistance of Crab Apple Clones to Rhagoletis pomonella (Diptera: Tephritidae)

Oviposition and larval survival of Rhagoletis pomonella (Walsh) varied significantly among fruit from 25 crab apple speciesand clones evaluated in field and laboratory studies. In general, the relative oviposition preference and larval survival was similar in fruit infested naturally in the field and fruit tested in the laboratory. Flies oviposited more in clones with larger fruit, although this relationship was more pronounced in laboratory tests when fruit was infested by laboratory-reared flies than in fruit infested in the field by wild flies. ‘Aldenhamensis,' ‘Fuji,' ‘Vilmorin,' Malus zumi calocarpa Rehd., and M. hupehensis (Pamp) Rehd. fruit was not infested in the field, but flies oviposited in fruit of all 25 species and clones in choice tests in the laboratory. Eggs hatched but larvae did not survive in fruit of ‘Henry F. DuPont,' ‘Frettingham,' ‘Fuji,' ‘Sparkler,' M. hupehensis, and M. zumi calocarpa. Larval mortality was very high in fruit from ‘Vilmorin,' ‘Sparkler,' ‘NA 40298,' ‘Henrietta Crosby,' ‘Golden Gem,' ‘Almey,' M. baccata L. (Borkh.), and M. sikktmensis (Hook.) Koehn

Modern approaches for breeding high quality apples with durable resistance to scab, powdery mildew and fire blight

New methods to allow for more precise selection of tree and fruit characters in breeding programmes were developed in recent years. Marker-assisted selection (MAS) is common practice in the ACW apple breeding programme at Wädenswil. Genetic markers can reduce the number of plants and the time required for evaluation, thus new varieties become commercially available sooner. How can this molecular selection method reasonably be applied in an apple breeding programme? Application of phenotypic and molecular selection techniques in the ACW apple breeding programme and results are presented

Recursos genéticos de macieira.

A maçã é de grande importância econômica e social, sendo a segunda fruta mais produzida no mundo. Grande parte desse sucesso é devido a atuação dos programas de melhoramento genético no desenvolvimento de cultivares adequadas às necessidades das regiões de cultivo e as exigências dos consumidores. No entanto, para que novas cultivares sejam obtidas, é fundamental que existam recursos genéticos conservados de maneira adequada e em quantidade suficiente para prover a diversidade genética necessária. Isso se torna ainda mais importante no atual cenário global, com mudanças climáticas iminentes que podem alterar de maneira drástica o cultivo da macieira. Assim, o objetivo deste trabalho foi reunir e discutir as principais informações sobre os recursos genéticos da macieira, para que possa ser utilizado como material de apoio para pesquisas e, dessa forma, contribuir para o desenvolvimento dessa frutífera

Resistenzzüchtung in Dresden-Pillnitz - Der Apfel

The Institute of Fruit Breeding has a long tradition in breeding resistant apple cultivars. Systematic resistance breeding started in the 1930 ties in Müncheberg. Material developed in Müncheberg was transferred in the 1970 ties to the Institute for Fruit Research, the antecessor of the Institute of Fruit Breeding. Based on this material, a couple of multiple resistant cultivars were generated. The time schedule for combining biotic and abiotic resistant traits which demonstrates the long-lasting period necessary for systematic resistance breeding is given. An overview of resistant cultivars of Dresden-Pillnitz and the respective resistant traits is presented. This assortment of cultivars was developed to provide a resistant cultivar for each ripening group and every application in fruit growing. Modern resistance breeding is focused on quality and combination of different resistance genes for each pathogene to achieve durable resistance. Selection is facilitated by genetic markers. Likewise the look for new resistance genes, the analyses of genetics and the development of basic material are main areas of interest. Practical approaches in apple breeding to reach these aims are reported

Puutarhantutkimuslaitoksen tiedote. N:o 10. Taimitarha ja dendrologia

Sisältö: Kallio, Tapio K.: Arboretum Yltöinen; Kallio, Tapio K.:Puutarhantutkimuslaitoksen puu- ja pensaskokoelma 1927-1976; Kallio, Tapio K, Karhiniemi, Anneli: Omenapuut (malus) koristekasveina; Kallio, Tapio K, Karhiniemi, Anneli: Kirsikat ja tuomet (prunus) koristekasveina; Kallio, Tapio K, Karhiniemi, Anneli: Ryhmäruusukokeet puutarhantutkimuslaitoksessa 1972-197

Application of molecular markers in apple breeding

Apple is economically the most important species of genus Malus Miller. In respect of production, trade and consumption, it ranks first among deciduous fruit and third on a global scale among all fruit species. Apple breeding is carried out on a large scale in several scientific institutes throughout the world. Due to this activity, apple is a fruit species with the highest number of described monogenic traits; 76 genes, encoding morphological traits, pest and disease resistance, as well as 69 genes encoding enzymes. The development of molecular markers (RFLPs, AFLPs, SCARs and SSRs) has allowed the mapping of the apple genome and the development of several saturated genetic maps, to which genes controlling important traits are assigned. Markers flanking these genes not only play an important role in selecting parental combinations and seedlings with positive traits, but they are also particularly important in detecting recessive traits, such as seedless fruit. In addition they enable pre-selection for polygenic quantitative traits. In recent years, particular attention has been paid to biochemical and physiological processes involved in the pathway of important traits e.g., ripening and the storage capability of apple fruit

Ornamental plants: annual reports and research summaries

The Ohio State University Extension Nursery, Landscape, and Turf Team (ENLTT) -- Extension Nursery, Landscape, and Turf Team (ENLTT) directory -- An evaluation of composts for landscape soil amendments / Mary Ann Rose and Hao Wang -- Aesthetic evaluation of crabapples at Secrest Arboretum in Wooster, Ohio: 1994-1995 / James A. Chatfield, Erik A. Draper, Kenneth C. Cochran, Peter W. Bristol and Charles E. Tubesing -- Evaluation of crabapples for apple scab at Secrest Arboretum in Wooster, Ohio: 1995 / Erik A. Draper, James A. Chatfield, Kenneth C. Cochran, Peter W. Bristol and Charles E. Tubesing -- Emergence, longevity, and aesthetic evaluations of flowers in ornamental crabapples at Secrest Arboretum in Wooster, Ohio: 1995 / Erik A. Draper, James A. Chatfield and Kenneth C. Cochran -- Environmental and cultural ornamental plant problems in Ohio: 1995 / Pamela J. Bennett and Jane A. Martin -- 1995 -A Challenging Year for Ohio golf courses / Joseph W. Rimelspach, John R. Street, Karl Danneberger, William E. Pound, Barbara Bloetscher -- Plant insect pest problems in Ohio: 1995 / Joseph F. Boggs, David J. Shetlar, Gary Yu Gao, Daniel Balser, Douglas C. Caldwell, Randall H. Zondag and James A. Chatfield -- Gypsy moth in Ohio: 1995 / Allan Baumgard, David F. James and Randall H. Zondag -- Landscape ornamental disease problems in Ohio: 1995 / James A. Chatfield, Nancy Taylor, Randall H. Zondag, Mary Ann Rose, Gary Yu Gao, Daniel R. Balser and David J. Shetlar -- The Response of native and naturalized trees to construction activity / T. Davis Sydnor, Joseph F. Boggs and Mary Ann Ros

Results of introduction of shrub species from Japan and China into botanical garden of BSTU

The article presents the results oftree and shrub species introduction from the region of Japan and China in a botanical garden of BSTU. Have been determined that conservation of species collection is about 75%. Mortality of species associated with changes of its area and environmental conditions of growth and the felling of certain tree and shrub species at the time of care

Ornamental plants, 1988: a summary of research

Follow-up evaluation of Cyanazine, Terbacil and Metolachlor slow-release herbicide tablets on woody landscape crops / E. M. Smith and S. A. Treaster -- Tolerance of daylily and peony to Surflan, Devrinol and Treflan / E. M. Smith and S. A. Treaster -- Growth response of euonymus, juniper and azalea treated with differing rates of Osmocote 18-6-12 / E. M. Smith and S. A. Treaster -- Evaluation of Ronstar wettable powder on woody landscape crops / E. M. Smith and S. A. Treaster -- An evaluation of Ronstar plus Diflufenican on container-grown landscape crops / E. M. Smith and S. A. Treaster -- Prodiamine evaluation in container-grown landscape / E. M. Smith and S. A. Treaster -- Evaluation of flowering crabapple susceptibility to apple scab in Ohio-1987 / E. M. Smith and S. A. Treaster -- Field study of root zone heating systems in greenhouses / M. F. Brugger and R. H. Zondag -- Costs of producing field rapid-growing evergreens (]uniperus) in Ohio / R. D. Taylor, H. H. Kneen, E. M. Smith, D. E. Hahn and S. Uchida -- Costs of producing field ornamental trees (Malus) in Ohio / R. D. Taylor, H. H. Kneen, E. M. Smith, D. E. Hahn and S. Uchid