2000年6～7月份,我市果园出现大面积苹果皲皮裂口,发生率达15％～20％,部分园片达100％。 一、皲皮裂口发生分布状况 该病多发生在持续中断水浇条件的泊地果园,前期浇水后期中断的耕地果园。在同一片园中,树势弱、有缺素症(如钙、硼)的发生严重;向阳面较背阴面轻,内膛重于外围,树上部比下裙轻;国光、富士品种重,嘎拉、乔纳金品种轻。从一个果来看,果肩和梗洼重,胴部轻,萼洼处几乎不发生。从上述发生分布状况看,该病的发生与水分、营养失调有关。 二、皲皮裂口发生的原因 果实在6～8月份急剧膨大,果内外细胞分裂速度均衡方能保证果面完整光滑,若内外层细胞分裂失调,果皮细胞分裂滞后于果肉细胞分裂就会导致 From June to July 2000, a large area of ​​apple skins broke out in the orchard of our city, with the incidence of 15% -20% and some of the garden tablets reaching 100%. First, the split bark occurs Distribution of the disease occurred in the continuous interruption of irrigated conditions po in orchards, pre-watering late cut off orchard. In the same piece of garden, the tree is weak, there is a shortage of elements (such as calcium and boron) of the occurrence of serious; sunny side of the more light-minded, heavier than the outer core, the upper part of the tree than the skirt light; Gala, Jonathan varieties light. From a fruit point of view, the fruit shoulder and peduncles weight, body light, rarely occurs at the calyx. From the distribution of the occurrence of the above situation, the occurrence of the disease and moisture, nutritional disorders related. Second, the cause of split skin split fruit in June to August the rapid expansion of the fruit inside and outside the cell division speed to ensure complete and smooth fruit surface, if the inner and outer cell division, the pericarp lag in the division of the pulp cells will lead to