核桃扁叶甲形态特征及生物学特性

Morphology and bionomics of Gastrolina depressa

核桃扁叶甲Gastrolina depressa Baly在山东泰安地区1a发生2～3代，以成虫在土壤中越冬。翌年4月上旬开始上树活动，补充营养后即交尾产卵、孵化，4月底第1代幼虫开始取食危害，5月达到危害高峰。5月底出现2代幼虫，6月中旬1代或2代成虫遇高温在浅土层或枯落物中“越夏”。7月底1代或2代成虫开始进行第2次危害，并交尾产卵、孵化，8月达到第2次危害高峰，9月下旬2代或3代成虫开始下树越冬。

Gastrolina depressa Baly has two or three gene-rations a year and overwinters as adult in soil in Tai＇ an, Shandong Province, The adult revives in early April the next year. The larva of the 1st gene- ration begins to feed and damage in late April with a peak in early May and the larva of the 2nd generation appears in late May. Adults of the 1st or 2nd generatidn begin to go into soil or litters for dormancy in mid-June. They appear to feed in July and reach the second peak of damage in early August. All adults go into soil or litters for overwintering in late September.