'Kordia' and 'Regina'are partially self-compatible cultivars and usually their fruit set and crop load are low in the southern Chile. Insufficient pollen availability due to lack of flowering synchronisation with pollinisers are one of the problems in some seasons, also excessive fruitlets drops have been reported. Different trials were carried out over three seasons in order to understand the phenomenon and to improve fruit set. The main objective of this study was to determine appropriate polliniser cultivars and the effective pollination period (EPP) for 'Kordia' and 'Regina'. The research was carried out in commercial orchards in the Central South region. Eight experiments were performed to determine the intensity of fruit set, using pollen from the following compatible cultivars:
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