FRUIT SET OF PLUM CULTIVARS UNDER HUNGARIAN ECOLOGICAL CONDITIONS

Five groups of cultivars were distinguished: completely self-sterile (fruit set 0%), self-sterile (0.1–1%), partially self-fertile (1.1–10%), self-fertile (10.1–20%) and highly self-fertile (above 20%).

The observed Japanese plum cultivars were considered as self-sterile because self-fertilization was not observed in each year and if there was any, the rate was low. In case of self-fertile cultivars open-pollinated flowers have a higher rate of fruit set than that of self-sterile cultivars; therefore they crop more safely than the others do. Incompatible cultivar-combinations are more rare with hexaploid European plum cultivars than with diploid Japanese type plum cultivars. Cacanska najbolja x Stanley and Methley x Shiro are an example of inter-incompatibility.

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