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Evaluation of ‘Jonagold’ apple trees on M.9 rootstock produced in different nurseries. II. Virus diseases

Władysław Poniedziałek, Kazimierz Nosal, Stanisław Porębski, Przemysław Banach

Department of Pomology
Faculty of Horticulture, University of Agriculture in Kraków
29 Listopada 54, 31-425 Kraków, Poland

In a study on the growth and bearing of ‘Jonagold’ apple trees on M.9 rootstock from Holland, The Czech Republic, and 12 Polish nurseries the infection of trees with virus diseases was investigated in the years 1993, 1995, and 1999. The percentage of trees infected with Apple chlorotic leaf spot virus (ACLSV) increased with the passage of time, reaching 35% in 1993, 52% in 1995, and 75% in 1999. In 1993 this virus was not found only in trees from the Puławy nursery while in 1995 the tests of its occurrence showed infection in 40% of trees. In the first years after planting, trees from this nursery were distinguished by vigorous growth and the best yielding. The poorly growing trees from Kraków were strongly infected with ACLSV. To the end of the experiment their yields and productivity were poor, although in further years of the study the growth was improved in comparison with that in the early stage of the study. Tests on the occurrence of Apple stem grooving virus (ASGV) and Apple mosaic virus (ApMV) were carried out only in the last year of the experiment (1999). Trees imported from Holland and The Czech Republic were infected with ACLSV and ASGV, but free of ApMV which was found on trees from all Polish nurseries. The infection of trees from Polish nurseries with ASGV ranged from 5% (Wróblowice) to 55% (Lublin) and with ApMV from 5% (Wróblowice and Kociołkowa Górka) to 25% (Kraków).

Poniedziałek W., Nosal K., Porębski S., Banach P., 2001. Evaluation of ‘Jonagold’ apple trees on M.9 rootstock produced in different nurseries. II. Virus diseases. Folia Horticulturae 13/2: 23-29.