Apple burrknots involved in trunk canker initiation and dying of young trees
2009
Kudela, V.,Vyzkumny Ustav Rostlinne Vyroby, Prague (Czech Republic) | Krejzar, V.,Vyzkumny Ustav Rostlinne Vyroby, Prague (Czech Republic) | Kundu, J.K.,Vyzkumny Ustav Rostlinne Vyroby, Prague (Czech Republic) | Pankova, I.,Vyzkumny Ustav Rostlinne Vyroby, Prague (Czech Republic) | Ackermann, P.,Statni Rostlinolekarska Sprava, Brno (Czech Republic)
Conditions associated with an unusually high occurrence of burrknots in two young commercial apple orchards at two locations, Tesetice and Stosikovice, South Moravia, Czech Republic, were analysed. The occurrence of burrknot was evaluated on trees of cvs. Early Smith, Jonagold and Gala on M.9 rootstock in the first orchard (planted in spring 2003) and on trees of cv. Gala on M.9 rootstock in the second orchard (planted in autumn 2002). The incidence of burrknots in cvs. Early Smith, Jonagold and Gala trees was 98, 97 and 92%, respectively. The burrknot severity was significantly higher on Jonagold trees than on the other two cultivars. In the second orchard, symptoms of burrknot appeared on 73.3% of trees planted on a slight slope and on 70.0% of trees planted on a plane. Correlations between burrknot number and number of root-suckers were not statistically significant. Five years after the tree planting, increased dying of Jonagold trees (5.5%) was recorded at Tesetice. The stem associated apple tree viruses Apple stem pitting virus (ASPV) and Apple stem grooving virus (ASGV) were detected frequently in the rootstock and scion parts of cvs. Jonagold and Early Smith and less frequently in Gala cultivar. The virus positive trees included individuals both with various burrknot severity and without symptoms of burrknots. There were no correlations between the incidence of burrknots and the presence of ASPV and ASGV.
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