ISHS Acta Horticulturae 193: XIII International Symposium on Fruit Tree Virus Diseases
TEN TO TWENTY-SIX YEARS OF FIELD INDEXING PRUNUS SPECIES WITH THE INDICATOR P. SERRULATA 'SHIRO-FUGEN' |
| Author: | G. Schmid |
| Abstract:
In mixed Prunus stands of the German speaking part of Switzerland Prunus ringspot virus infections were found to be high: Prunus avium 76% (120 tested), P. myrobalana 35% (148) and P. insititia cv. 'St. Julien' 38% (116). Virus transmission was studied under various conditions. In 1958 virus free sweet cherry trees were planted in non-isolated orchards. After 26 years 5 of the remaining 95 trees were infected. In the surrounding of the orchards a mean of 34% of the trees were infected. In isolated plots, where virus free trees were planted for scion production, no infection occurred after 10–25 years (149 sweet cherry, 113 prune trees). In another isolated plot of 88 trees planted for seed production all stayed healthy for 11–26 years (sweet cherry, P. myrobalana, P. 'St. Julien'). Seed trees located in mixed stands were also investigated: New infection was found after 11–19 years on 5 of 62 P. myrobalana and P. 'St. Julien' and none of 13 sweet cherry trees were infected. In a bearing prune orchard with 46 healthy and 33 diseased trees only 3 were found to be freshly infected after 6 years. Seed transmission of the virus from healthy mother trees of the above mentioned Prunus species was less than 0.2% (1228 seedlings tested). | |
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