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桃树缩叶病是为害桃树的严重病害之一,尤其对水蜜桃为害最烈,在天气久旱不雨的年份发病更为猖獗。此病的病菌孢子主要是在芽鳞或树皮上越冬,春天展叶后侵入嫩叶。4月下旬至5月中旬是发病的高峰时期。被害叶片肥厚、隆肿,叶缘反卷,初为红色,逐渐变成褐色,叶面上生一层灰白色囊孢子,最后萎缩枯落。严重时半数叶片甚至全树叶片受害掉落,造成果子小,果肉硬绵,易龟裂早落,严重影响产量和质量。
Pear tree leaf disease is one of the pest damage pests, especially peaches most damaging in the weather is dry and rainy years more rampant incidence. The disease spores of the disease is mainly in the bud scales or bark overwintering, spring leaves after infiltration of young leaves. The end of April to mid-May is the peak incidence. Victims of follicular hypertrophy, swelling, leaf edge roll, the beginning of the red, gradually turned brown, a layer of gray ascospores on the foliage, and finally shrinking withered. In severe cases, half of the leaves or even the whole tree leaves fall, resulting in small fruit, hard and flesh, easy to crack early, seriously affecting the yield and quality.