Linkage relationships of 19 enzyme loci have been examined. The chromosomal locations of eight of these loci are formally reported for the first time in this paper. These localizations should assist in the construction of additional useful chromosome marker stocks, especially since several of these enzyme loci lie in regions that were previously poorly mapped. Six loci are on the long arm of chromosome 1. The arrangement is (centromere)—Mdh4-mmm-Pgm1-Adh1-Phi-Gdh1, with about 46% recombination between Mdh4 and Gdh1.—Linkage studies with a2 and pr have resulted in the localization of four enzyme genes to chromosome 5 with arrangement Pgm2-Mdh5-Got3-a2-(centromere)-pr-Got2. Pgm2 lies approximately 35 map units distal to a2 in a previously unmapped region of the short arm of 5, beyond ameiotic.—Approximately 23% recombination was observed between Mdh4 and Pgm1 on chromosome 1, while 17% recombination occurred between Mdh5 and Pgm2 on chromosome 5. Similarly, linkages between Idh1 and Mdh1, about 22 map units apart on chromosome 8, and between Mdh2 and Idh2, less than 5 map units apart on chromosome 6, were observed. Thus, segments of chromosomes 1 and 5 and segments of 6 and 8 may represent duplications on nonhomologous chromosomes.

In this study, 15 early-ripening strawberry cultivars were evaluated on 11 sites in Austria regarding their susceptibility to root and leaf diseases. The main aim was to find cultivars with field resistance to Verticillium dahliae and other soilborne pathogens and to explore the interactions between cultivars and sites. ' Daroyal', 'Clery', 'Asia', 'Betty', 'Queen Elisa', and 'Alba' showed a comparably high vitality on all sites and a low number of plant losses on one site highly infested with V. dahliae. Cultivars susceptible to Verticillium wilt, were also prone to root diseases on non-infested sites. In addition, interactions between cultivars and sites played a significant role.

Weissinger H., Flachowsky H., Spornberger A., 2014. New strawberry genotypes tested for organic production on a Verticillium-infested site. Hort. Sci. (Prague), 41: 167-174.Nineteen new strawberry breeding clones, bred at the Institute for Breeding Research on Fruit Crops in Dresden-Pillnitz, Germany, were evaluated for their suitability for organic production at a Verticillium-infested site in Vienna, Austria. Soil cover, plant vitality, resistance to leaf spot diseases as well as flower damages by the strawberry blossom weevil (Anthonomus rubi) and by spring frost were recorded. In two consecutive years, marketable yield and fruits infested by Botrytis cinerea were assessed. Three breeding clones, P-7189, P-8043 and P-8071, were considered as suitable for organic strawberry production. P-7189 and P-8043 showed high tolerance to Verticillium wilt. The breeding clones P-8155 and P-8166 performed well under organic management but had very soft fruits that were not acceptable for commercial fruit production. The rest of the breeding clones were low-yielding, however, some of them could be of interest for home gardens due to their good flavour and high plant vitality.

No abstract

3O r i g i n a l b e i t r a g Zusammenfassung bei erdbeeren nimmt der anbau auf Mulchfolien zu. in dieser arbeit wird die photoselektive Pe-Mulchfolie "agri-black" mit einer herkömmlichen Mulchfolie und mit der traditionellen anbaumethode "offener boden + Stroh zur blüte" verglichen. besonderheiten von "agri-black" sind die Verwendung von alternativen Farbpigmenten anstatt von russ und erhöhte UV-absorption, was ein verändertes Keimverhalten von Unkraut sowie eine Verfrühungswirkung erwarten lässt.Untersucht wurden die auswirkungen auf den Unkrautwuchs durch die Pflanzlöcher während der Kultur, länger-fristige herbizide effekte nach entfernen der Folien, sowie die auswirkungen auf ertrag und Fruchtgesundheit der erdbeeren.Der Unkrautdurchwuchs während der Kulturdauer wurde durch "agri-black" im Vergleich zur herkömmlichen Folie tendenziell, jedoch nicht signifikant reduziert. Sechs Wochen nach entfernen der Folien war die gesamtanzahl der Unkräuter bei "Agri-Black" signifikant geringer als bei der herkömmlichen Folie, bei einzelnen arten wurden jedoch keine signifikanten Unterschiede zwischen den beiden Folien festgestellt. auf grund lang andauernder regenfälle kurz vor Erntebeginn, in Kombination mit der flachen anbauweise, kam es bei beiden Folienvarianten zu starken Pflanzenschäden und zu weit niedrigeren Erträgen als in der Kontrollvariante "offener boden + Stroh zur blüte".Bei der Kontrollvariante wurden im Gegenzug signifikant mehr Früchte durch Schnecken angefressen als bei den Folienvarianten.Schlüsselwörter Mulchfolie · Unkraut · Keimung · licht · erdbeeren · biologischer anbau · Schnecken Abstract The use of mulch films is gaining importance in strawberry production. in this paper, the photoselective PE-mulch film "Agri-Black" is compared with a common PE-film and with the traditional method "open soil + straw mulch at blossom". "Agri-Black" is produced with a blend of alternative colour pigments instead of carbon black and with a high amount of UV-absorbers which may lead to an altered germination behaviour of weeds and to an earlier harvest due to higher soil temperature.the effects on the growth of weeds through the planting holes of the films, long-term herbicide effects after removing the films, and the effects on yield and fruit quality of the strawberries were analysed.Weed growth through the planting holes was reduced by trend by "Agri-Black" in comparison to the common PE-film, but not significantly. Six weeks after removing the films, the total amount of weeds was significantly lower in parcels with "Agri-Black" than in parcels with the common PE-film. Regarding single species, no significant differences between the films were determined. Long lasting rainfalls before harvest, in combination with flat beds, did result in heavy plant damages in both film variants and thus in much lower yield than in the control variant "open soil + straw mulch at blossom". In the control variant, there erwerbs-Obstbau (