文献类型： 会议论文

第一作者： S. E. Glazowska

作者： S. E. Glazowska ¹ ; M. Schiller ¹ ; P.R. Johnston ² ; O. S. Lund ¹ ; M. Korsgaard ³ ;

作者机构： 1.University of Copenhagen, Faculty of Science,Department of Plant and Environmental Sciences, Hoejbakkegaard Alle 13, DK-2630 Taastrup, Denmark

2.JohnstonP@landcareresearch.co.nz,Landcare Research, Private Bag, 92170 Auckland, New Zealand

3.Gefion, Fulbyvej 15, DK-4180 Soroe, Denmark

关键词： Elsinoe pyri;Topaz spot;organic apple production;apple cultivars;apple disease

会议名称： International Conference on Organic Fruit-Growing

主办单位：

页码： 83-89

摘要： A fungal-like apple disease, known as 'Topaz-spot" in Europe, appeared in Denmark in the year 2000. It has now spread throughout Denmark as a problem in untreated, organic production of apple (Maius domestical The causing organism of the symptom 'Topaz spot" has been identified as the ascomycete Elsinoe pyri (Wor.) Jenkins. The fungus was identified by pyrosequencing analysis of DNA and by isolation of E. pyri from infected apple skin (Glazowskaet al, 2013).Symptoms of E. pyri, called "Elsinoe leaf and fruit spot", appeared as numerous brown spots on leaves and black spots on fruits. Leaf spots were typically 0.5-4 mm in diameter and fruit spots 2-5 mm, both with a pale centre surrounded by a dark halo. Toour knowledge this is the first time Elsinoe pyri has been associated with Topaz spot". The apple cultivar 'Topaz' is susceptible to E. pyri, but other cultivars are even more susceptible. A survey of 85 apple cultivars in 11 unsprayed Danish organic orchards was carried out in 2013. The disease was present in all orchards throughout the country and in all but two cultivars. Infections of the cultivars of "Elsinoe leaf and fruit spot" on leaves ranged from 0 to 100 %.

分类号： s66-532