论文部分内容阅读
小云斑鳃金龟广布于甘肃中部海拔1700—2300米高寒阴湿地区农田,平均虫口密度2.8头/米~2。经分罐单头饲养2880头并结合田间定点系统观察,初步明确1个世代历期1369—1547天,平均1461.5天。成虫不取食,以一龄幼虫和第一年的三龄幼虫对作物为害最重。第二年老熟三龄幼虫基本不取食。以各龄幼虫在土内越冬,1年中幼虫在土内的升降活动曲线呈单峰型,5—9月份均为害。不下潜越夏,它反映了西北高原地区蛴螬的升降规律,为制定防治策略提供了依据。
Small cloud spot gills beetles widely distributed in central Gansu 1700-2300 meters above sea level in the areas of cold and humid wetlands, the average population density of 2.8 head / m ~ 2. 2880 heads were sub-canned and combined with the field fixed point system observation, initially clear a generation of 1369-1547 days, an average of 1461.5 days. Adults do not feed, with the first instar larvae and first instar larvae most damaging to the crop. Second year old third instar larvae basically do not feed. The larvae of all ages were overwintering in the soil. The curve of the ascending and descending activities of larvae in the soil showed a single peak in one year, and was harmful in May-September. It does not dive over the summer, which reflects the law of ascending and descending in the Northwest Plateau, and provides the basis for the prevention and control strategy.