梨叶早衰脱落主要类型表现与防控对策

梨叶早衰脱落现象的严重发生，成为困扰部分梨产区提高产量、增进品质的重大生产技术难题。本文综合作者长期调查研究结果与相关报道资料，将梨叶早衰脱落现象归纳为水分失调型、营养失调型、病虫为害型、郁闭寡照型、肥害药害型五大类型，并对类诱发因素、症状表现、发生规律及关键防控对策进行分别阐述，以助相关从业者鉴别区分和更加有效地开展防控。

The Performances and Prevention and Control Measures of Pear Main Early Defoliation Types

The phenomenon of early-senescence and defoliation of pear leaves occurrs severely. Pear early defoliation becomes the major production technical problems of hindering the yield and quality improvement in some pear main production areas. long-term Investigation and research and related information, the pear early defoliation phenomenon were classified five types: hydraulic stepout, nutritional disorder, diseases and pests damage, canopy closure and sparse sunlight, fertilizer and pesticide injury. Besides, the inducing factors, character performances, occurrence regularities and the key control measures were expounded respectively to help related practitioners discriminate the types and implement control measures more effectively.