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采用挖树根查虫的方法,调查越冬虫态在臭椿树根部的分布情况。结果显示,沟眶象越冬代成虫主要集中在21～30cm深的土层中,幼虫主要集中在31～40cm深的土层中;在0～10cm深度的土层中成虫、幼虫均较少;成虫、幼虫所处平均深度分别为32.6cm、32.9cm,极值深度分别为60cm、55cm。成虫、幼虫所处平均树干距离分别为22.7cm、18.8cm,极值树干距离均为49.0cm。沟眶象83.0%的成虫、90.4%的幼虫分布于深度0～40cm、与树干距离0～40cm的土层中。
The method of digging the roots of pests was used to investigate the distribution of the overwintering pests in the root of Ailanthus altissima. The results showed that adults of orbital orbital overwintering were mainly concentrated in the soil layer of 21-30 cm depth, while the larvae mainly concentrated in the soil layer of 31-40 cm depth. There were less adults and larvae in the depth of 0-10 cm. The average depths of adults and larvae were 32.6cm and 32.9cm respectively, and the extreme depths were 60cm and 55cm respectively. The average trunk distance of adults and larvae was 22.7cm and 18.8cm respectively, and the extremum trunk distance was 49.0cm. The adults of orbital orbital, 83.0% and 90.4% of the larvae distributed in the depth of 0 ~ 40cm, and the trunk distance 0 ~ 40cm soil.