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对黑水县三个不同海拔高度 (1810～ 2 40 0 m)的山洞内白蛉密度的变化情况进行了调查 ,并对捕获的白蛉作了鉴定 ,发现三个观察点的白蛉皆系中华白蛉 ,在一年内均有两个密度高峰期 ,白蛉全年持续活动时间约为四个半月。
The density of whitefly in the cave at three different altitudes (1810 ~ 240m) in Heishui county was surveyed and the captured whiteflies were identified. The results showed that all the whiteflies Chinese whitefowl, both in one year have two peak density, Bailey throughout the year duration of about four and a half months.