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龟纹瓢虫(Propylaea japonica(Thunberg))是汉川棉田害虫主要天敌之一。1984年6月下旬至7月中旬,就两种有机磷内吸杀虫剂:40％氧化乐果和50％甲胺磷,采用涂茎和喷雾的方式治蚜对瓢虫的影响,进行了初步观察。 室内测定 从棉田捕回龟纹瓢虫成虫,室内群体饲养,将新孵化的幼虫和羽化的成虫分别用指管单头饲养,按15头为一组,重复2次。每日投放药剂处理的带毒棉蚜饲喂。瓢成虫管内投放10头;1～2龄幼虫管内放5头;3～4龄幼虫管内放10头。对照管内投放无毒蚜虫,逐日累计管中被食蚜虫,并统计瓢虫中毒死亡率,结果见表1。
Propylaea japonica (Thunberg) is one of the main natural enemies of pests in the Hanchuan cotton field. From late June to mid-July 1984, the effect of aphid treatment on ladybugs was studied using two pesticides: 40% omethoate and 50% methamidophos. Preliminary observation. Indoor determination Trapped ladybug adult cotton from the cotton fields, indoor groups feeding, the newly hatched larvae and feathering adults were fed with a single tube, according to a group of 15, repeated 2 times. Daily drug treatment of infected cotton aphid feeding. The larvae were put in the tube 10; larvae 1 to 2 larvae placed 5; 3 to 4 larvae placed 10 tubes. The control tube was put on non-toxic aphids, daily accumulation of aphids in the tube, and statistical ladybug poisoning mortality, the results shown in Table 1.