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一、落花落果的主要成因 1、花器不完全。胚珠发育异常是巨峰葡萄落花落果的主要原因。胚珠异常则可造成不完全受精或者完全没有受精能力而引起落花落果。巨峰胚珠异常一方面是由于遗传原因,同时也有在萌芽后花蕾发育过程中退化形成,还有的在花后由于受精不良而使胚珠发育不完全。 2、贮藏营养不足。葡萄冬花分化时间较长,一般当年芽内只能分化出花序的各级分枝,花器的其它部分需等到第二年冬芽萌动时才陆续分化。一般在出叶后第一周左右形成萼片,第二周形成花瓣,第三四周出现雄蕊和雌蕊。这些器官的分化和形成主要依赖树体内上年的贮藏营
First, the main causes of falling flowers 1, flowers are not complete. Ovule dysplasia is the main reason for the drop of Kyoho grape. Abnormal ovules can result in incomplete or unfertilized abortion. Kyoho ovule abnormalities on the one hand due to genetic reasons, but also in the process of flower buds after germination degeneration formation, and some in the post-flowering due to poor fertilization and ovule development is not complete. 2, lack of nutrition. Grape winter flower differentiation for a long time, the general bud can only differentiate out of the branches at all levels of inflorescence, the other parts of the flower need to wait until the second year of winter bud germination only gradually differentiation. The sepals are usually formed in the first week after leaves, petals in the second week, and stamens and pistils in the third week. The differentiation and formation of these organs is mainly dependent on the previous year’s storage camp in the tree