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杏树早期落叶原因及防治答陕西读者孙西印杏树早期落叶大致由缺铁、细菌性穿孔病和早期落叶病造成。现将各种症状及防治方法介绍如下：１缺铁由于缺铁引起的生理性病害，表现为新梢顶端嫩叶先变黄，但叶脉两侧仍为绿色。６～７月间，随着病情加重，叶片出现严重脱落。防治...
Apricot early deciduous causes and prevention and control of Shaanxi readers Sun Xinyu early deciduous trees generally caused by iron deficiency, bacterial perforation and early deciduous disease. Now a variety of symptoms and prevention methods are described below: 1 Iron deficiency due to iron deficiency caused by physiological diseases, the performance of the tip of young shoots turn yellow first, but the veins are still green on both sides. Between June and July, the leaves appeared severely shedding as the disease progressed. Prevention ...