(=The using of natural enemies There are three measure in order to protect and make use of natural enemies: (1)Direct protection. Moving the wintering ladybird out of door can decrease its mortality and death rate. 直接保护。越冬瓢虫移到室内保护可以降低 其死亡率。（二）The using of natural enemies There are three measure in order to protect and make use of natural enemies: (1)Direct protection. Moving the wintering ladybird out of door can decrease its mortality and death rate. 直接保护。越冬瓢虫移到室内保护可以降低 其死亡率