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苹果小叶病是缺锌造成的一种生理性病害,其症状表现为:病枝春季发芽较晚,抽叶后生长迟缓甚至停滞,叶片狭小细长,叶缘向上卷起,质厚而脆,叶片呈淡黄绿色,或浓淡不均,病枝节间短,叶细丛状簇生。病树花芽减少,花朵小而色淡,坐果率极低,果小或畸形。幼树根系发育不良,老树根系有腐烂现象。病枝下有的能抽出新梢,或仍表现节间短,叶细小,或发枝正常。树体多衰弱产量低。 一、土壤缺锌,或土壤中锌盐不能被利用,或元素间比例失调而导致的小叶病 苹果是多年生深根性植物,和一年生植物相比,更易发生缺
Apple leaflet disease is caused by a lack of zinc physiological symptoms, the symptoms are as follows: sick branches spring germination later, slow growth or even stagnation after the leaf pumping, narrow slender leaves, rolled up the leaf margin, thick and brittle, Leaves pale yellow-green, or uneven, diseased branches internodes, clusters of clusters of thin clumps. Sickle flower buds to reduce the flowers small and pale, fruit setting rate is very low, fruit small or deformity. Saplings root dysplasia, old roots rot. Some branches under the branches can be taken out, or still show short internodes, small leaves, or normal hair. Multi-decaying tree yield is low. First, the soil zinc deficiency, or zinc salts in the soil can not be used, or the imbalance between the elements caused by the lobular disease Apple is a perennial deep rooted plants, and annual plants are more prone to lack