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0引言榆树是一种落叶乔木,种子属于被子植物门,早春叶前开花,花期3—4月,种子5—6月成熟。在园林绿化当中使用广泛,可用于防护林、绿篱、园林小品等的种植。近年来,随着园林绿化事业的发展,榆树病虫害发生严重,根据实践经验总结虫害防治技术。1虫害发生原因(1)园林绿化当中榆树跟其它树种植在一起,互相传播病虫害。(2)在引进苗木、种子或嫁接等过程中带入病虫害。
0 Introduction Elm is a deciduous tree, the seeds belong to the door angiosperm, early spring before flowering, flowering 3-4 months, the seeds mature from May to June. Widely used in landscaping, can be used for shelterbelts, hedges, garden pieces and other cultivation. In recent years, with the development of landscaping, diseases and pests of elm trees are serious, and pest control technologies are summarized according to practical experience. 1 causes of pests (1) Among the landscaping elm trees planted with other trees, mutual spread of pests and diseases. (2) bring in pests and diseases during the process of introducing seedlings, seeds or grafting.