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柏小爪螨Oligonychus perditus pritchard et Baker是重要的林业害螨之一,在我国分布很广,寄主植物主要是松柏类植物。柏小爪螨以卵越冬,第二年3月下旬至4月上旬孵化。4、5、6月份虫口数量上升;7、8月份因天气炎热,数量下降;9月中、下旬开始,虫口数量又逐渐上升;10月中旬以后虫量减少,12月下旬室外找不到成螨和若螨。从幼螨到成螨的历期,平均温度10.8℃时,雄螨平均为13.2(±1.3)天,雌螨为12.5(±2.3)天;在21.5℃时,雄螨为9.6(±0.6)天,雌螨为9.7(±(0.8)天;在恒温20℃时,雄螨为10.4(±1.1)天,雌螨为10.1(±1.3)天。卵历期在17.2℃时,平均为14.3(±1.3)天;25.7℃时为6.7(±0.8)天;恒温20℃时为7.1(±0.5)天。成虫寿命在同样条件下,雌螨比雄螨长。雌螨在21.5℃时产卵量较高,而在恒温20℃时产卵量不高。
Oligonychus perditus pritchard et Baker is one of the important forestry pests, distributed widely in our country, the host plant is mainly coniferous plants. Small cyperus penguin overwintering eggs, the second year in late March to early April hatch. In April, May and June, the population of insects increased; in July and August, the number of insects increased due to the hot weather; in mid-September and late September, the population of insects increased gradually; the number of insects decreased after mid-October, and could not be found outdoors in late December Mites and nymphs. The male mite averaged 13.2 (± 1.3) days and the female mite 12.5 (± 2.3) days at an average temperature of 10.8 ° C from the young mite to the adult mite; the male mite was 9.6 (± 0.6) at 21.5 ° C, Day, female mites were 9.7 (± (0.8) days; male mites were 10.4 (± 1.1) days and female mites were 10.1 (± 1.3) days at a constant temperature of 20 ° C, with an average of 14.3 at 17.2 ° C (± 1.3) days, 6.7 (± 0.8) days at 25.7 ° C, and 7.1 (± 0.5) days at 20 ° C. Adult longevity Under the same conditions, female mites grow longer than male mites. The amount of eggs is higher, but the amount of eggs is not high when the temperature is 20 ℃.