SIMULTANEOUS FLOWERING OF PEAR VARIETIES AND OVERLAP OF FLOWERING CURVES IN DIFFERENT VARIETY CONBINATIONS

The rate of simultaneous flowering, and overlap of flowering curves was evaluated based on 182 variety combinations.

According to our results combinations were put into 3 groups:

1. tight overlap: overlap of flowering curves is usually more than 70 % and not lower than 50 % in any years.
2. rate of overlap is not adequat: it is lower than 50 % in most of the years.
3. instabil overlap: in most of the years the overlap is more than 70 %, but sometimes lower than 50 %.

Using a pollinizer, only varieties of the first group assure safe overlap. The rate of overlap of pollinizers can be higher using several (2–3) pollinizer varieties. When 2 pollinizers are used it is advisable to choose one variety flowering 2–3 days earlier and another variety flowering 1–2 days later than the variety to be pollinized. With this method, 90–100 % overlap is provided for the variety to be pollinized.

According to our results pairs of varieties with the high rate of overlap may be determined well, and assure to choose the optimal pollinizer for a certain variety.

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