Pathotype diversity of common bean rust in Bulgaria | Патотипно разнообразие на ръждата по фасула в България
2009
Beleva, M., Dobroudja Agricultural Institute, General Toshevo (Bulgaria) | Kiryakov, I., Dobroudja Agricultural Institute, General Toshevo (Bulgaria)
Common bean rust is an economicaly important disease on common bean in moderately humid areas of the world. In Bulgaria the disease occurs annualy in the Rhodoppi mountains and has sporadic occurance in plain regions. Until 2004, ten physiological races had been identified in Bulgaria. The objective of this study was to investigate the pathotype diversity of bean rust in Bulgaria. Bean rust populations were collected from eight location. One hundred and ten single-uredinium isolates were made from the collections. Their virulence to bean rust differential set referred them to ninety pathotypes grouped into nine physiological races. Thirty-two pathotypes had to be referred to Andean-specific pathotypes of U. appendiculatus. The pathotypes of race 20-0 were the most frequently observed and distributed, followed by pathotypes of races 20-3 and 20-2. Some pathotypes were distributed in different regions in Rhoddoppi, as well as in North Bulgaria. The pathotype diversity differed both by years and regions. The results from the principal component analisys showed that the Andean cultivars were more important for indetification of races and pathotypes of Bulgarian population of U. appendiculatus.
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