人们对果树病虫害往往只重视生长期的防治,而忽视冬季及病原的初次侵染、害虫出蛰期的防治。其实,前期防治是全年防治的重要时机,其理由是:①害虫越冬场所比较集中,虫龄期一致,有利于集中消灭。②越冬病原在初春随温度上升开始初次侵染,越冬害虫也开始出蛰为害,初次侵染和出蛰为害的时 Pests and diseases of fruit trees tend to focus only on the prevention and control of growth stages, while ignoring the initial infection in winter and pathogen, pest out of the sting. In fact, the early prevention and control is an important time of the year for prevention and control. The reasons are as follows: ① The overwintering habitats of pests are concentrated and the pest age is consistent, which is beneficial to the concentration elimination. ② overwintering pathogen in early spring with the temperature began to initial infection, overwintering pests also began sting damage, the initial infection and sting damage