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笔者日前从甘肃省林业有害生物防治检疫局获悉,由于去冬今春气温明显偏高,多雨、高温等复杂多变天气交替出现,为河曲丝叶蜂越冬创造了有利气候条件,越冬基数明显增加。据监测调查,今年河曲丝叶蜂发生时间比往年提前,目前华池、正宁、庆城、合水等县成虫羽化已进入高峰期,初孵幼虫已开始产生危害,预计幼虫孵化高峰为8月下旬到9月上旬。针对河曲丝叶蜂幼虫取食量大,危害时期长,主要寄主植物金丝柳多为行道树等特点,为了及时控制虫害扩散蔓延,巩固造林绿化成果,维护生态安全,近日,庆阳市森防站积极筹措
Recently, the author learned from Gansu Provincial Bureau of Pest Control and Quarantine of Pests that due to the obviously higher temperatures in winter and spring, complicated and changeable weather like rainy weather and high temperature appeared alternately, which provided favorable climatic conditions for winter wintering overwintering, and the base of overwintering obviously increased. According to the monitoring survey, the occurrence time of Beauveria bumblebee will be earlier than that in previous years this year. At present, the adult eclosion of Huachi, Zhengning, Qingcheng and Heshui has entered the peak period and the newly hatched larvae have started to have the harm. The larvae hatching peak is expected to be 8 Late in the month to early September. In order to control the spread of insect pests, consolidate the achievements of afforestation and maintain the ecological security, the river wildebeest larvae consume large amounts of food and endanger the long period of time. The main host plant, Station actively raise