FRUIT SET OF PLUM CULTIVARS UNDER HUNGARIAN ECOLOGICAL CONDITIONS

Fruit set of 56 European and 10 Japanese type plum cultivars were observed in 7 growing regions between 1982 and 1989.

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.

II Workshop on Pollination

J. Nyéki, Z. Szabó

Fertilization, incompatibility

https://doi.org/10.17660/ActaHortic.1996.423.24