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榆兰叶甲(Calerucella aenescns Fairm)俗名榆兰金花虫,近些年来危害榆树较重.河北全省发生近亿株,成片枯死,严重威胁榆树的发展.此虫在河北省一年发生二代,以成虫越冬,翌年3月下旬至4月上旬出蛰上树,取食产卵,第一代幼虫出现在4月下旬,第一代成虫出现在6月上、中旬,7月上旬孵化出第二代幼虫,第二代成虫很少取食即进入越冬。对此虫的防治,各地采取了一些防治措施,如用氧化乐果涂干,呋喃丹埋根、人工捕杀老熟幼虫(蛹),树上喷氧化乐果等都可取得较好的防治效果。以防好越冬代成虫和第一代幼虫是关键。
The common name of Ulmus giganteum in the Calerucella aenescns Fairm, which harms the elm in recent years, is nearly 100 million in the whole province of Hebei Province, which is a dead leaf that threatens the development of the elm tree. The second generation, the adult overwintering, the next year from late March to early April out of a tree on the sting, feeding spawning, the first generation larvae appear in late April, the first generation of adults appear in June, mid, early July The second generation of larvae hatch, the second generation of adults eat less into the winter. Prevention and control of this insects, taken around a number of prevention and treatment measures, such as coated with omethoate, furadan buried root, artificial killing of mature larvae (pupae), the tree sprayed omethoate, etc. can achieve better control effect . Preventing overwintering generations of adults and first-generation larvae is key.