What is the reason for the fruit drop of Corylus heterophylla?

The flowering and fruiting of hazel trees are mainly concentrated in three periods: in the first period, unfavorable pollination weather leads to poor pollination and fertilization, and the unpollinated and fertilized flowers gradually fall off with the growth of new shoots after flowering; The second period is the nut expansion period of vigorous growth of new shoots, which leads to fruit drop due to malnutrition; The third stage is the late growth stage of hazelnut, which will lead to fruit drop due to insufficient nutrition and pests and diseases.

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