红香蕉、红星、红玉等品种的苹果，在果实接近成熟、采收之前，由于果实内部乙烯含量增加，呼吸强度增强，致使果柄产生离层而自然脱落。这种落果，就叫“采前落果”。采前落果，对苹果的产量和品质，都有较大影响。 防止苹果采前落果，除保护好整体果树叶片完好，调整合适的结 Red banana, red star, ruby ​​and other varieties of apples, fruit close to ripening, harvesting before, due to the increase of ethylene content in the fruit, respiratory intensity increased, resulting in the stalk separation from the natural shedding. This drop, called “before the harvest fruit.” Pre-harvest fruit, apple production and quality, have a greater impact. Prevent the apple from falling before the harvest, in addition to protecting the whole fruit tree leaves intact, adjust the appropriate knot