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榆树爱招虫子,除了常见的金龟子、灯蛾外,刺吸式害虫的威胁也不容小觑。无论如何,“防”字当头,综合治理,总是对付害虫的最佳策略。近年来,随着园艺品种的丰富,各类景观榆树逐渐走入人们的视野:枝干虬曲的龙爪榆,四季金黄的金叶榆,枝条潇洒下垂的垂枝榆……大到城市行道树的列植、模纹花坛的搭配,小到庭院孤赏树的点缀、假山小景的配植,到处都有它们的身影(图1～4)。随着应用的日益广泛,病虫害也随之而来,尤其是榆四脉棉蚜与大青叶蝉两种刺吸式害虫发生较重,严重影响景观榆树的观赏价值。怎么对付它们呢?
Elm lobster insects, in addition to the common beetles, moths, the threat of sucking pests can not be underestimated. In any case, “anti-” overwhelming, comprehensive management, always the best strategy to deal with pests. In recent years, with the rich variety of horticultural species, all kinds of landscape elm trees gradually come into people’s perspective: the branches of the dragon claw Ulmus, the golden seasons allure, the drooping branches droop elm ... to the city line tree column Planting, pattern flower bed with a small garden ornamental trees to embellishment, small rockery with plants, everywhere they have figure (Figure 1 ~ 4). With the application of more and more widespread, pests and diseases also followed, especially the two four kinds of sucking pests such as Ulmus pumila and Aphis gossypii, which seriously affected the ornamental value of landscape elm. How to deal with them?