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新红星苹果盛花后30—38d出现6月落果高峰.盛花后10—20d,即5月上旬落果果实细胞生长减缓,是6月落果发生的主要原因.落果果实种子发育大部分正常,授粉受精良好.落果果实体积极显著小于正常果.花序分离期疏花序成单花能明显增加落果后负荷;4月底5月初间隔1周喷2次100mg·1~(-1)GA、0.4%尿素、0.4%过磷酸钙浸出液或0.4%硫酸钾均能明显减轻6月落果.
The fruit of Newcastle apple appeared in the peak of Junefall from 30-38d after flowering.It was the main reason for the drop of fruit in10days after flowering in early May, . The fruit volume of fallen fruit was significantly less than that of normal fruit. The flowering senescence of single inflorescence increased the load of fallen fruit significantly. At the end of April and early May, 100 mg · -1 -1 GA, 0.4% urea and 0.4% % Superphosphate leaching solution or 0.4% potassium sulfate can significantly reduce the fall of June.