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The aim of this research is to analyse the influence of the time of first fruit colour change and duration of fruit ripening of 19 cherry varieties on the infestation percentage by the European cherry fruit fly ( Rhagoletis cerasi L.) for 2008/2009. The infestation percentage grew proportionally depending on the time of first fruit colour change from 3% for the group of varieties which started earlier with the fruit colour change to 46.2% for the group of varieties which started later with the fruit colour change for 2008, and from 0% to 65.7% for 2009, respectively. The infestation percentage grew proportionally with the duration of fruit ripening of the cherry varieties, from 10.3% for the group of varieties with a short ripening period to 55.2% for the group of varieties with a long ripening period.

Influence of the time of first fruit color change and the duration of fruit ripening of cherry varieties on the infestation by R. cerasi