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田间系统调查结果表明,棚室番茄植株上主要害虫为烟粉虱和蚜虫;巴氏钝绥螨和胡瓜钝绥螨均对烟粉虱虫口密度具有一定的抑制作用,其控害持效期50 d左右。2种捕食螨、2个释放密度对烟粉虱的控害效果无显著性差异,但巴氏钝绥螨控害作用略强于胡瓜钝绥螨。烟粉虱种群时间生态位宽度值为捕食螨释放区大于空白对照区,化防区最低,其值仅为0.5818;表明化防区目标害虫虫口数量在时间系列上分布的不均匀性,种群波动幅度较大,有暴发成灾的可能;而生防区害虫种群变化较稳定,不易成灾。烟粉虱种群空间生态位宽度在各处理区间无显著差异。
The results of field investigation showed that the main pests on tomato plants in greenhouse were Bemisia tabaci and aphid. Both the Amblyseius acutissima and Amblyseius cucumeris showed inhibitory effects on the population density of Bemisia tabaci, d or so. There were no significant differences in the control effects of two kinds of predatory mites and two released density on Bemisia tabaci. However, the control effect of A. misticus was slightly stronger than that of A. cucumeris. The time niche breadth of Bemisia tabaci population was larger than that of the blank control area, and the value of the zone was the lowest (0.5818). It showed that the number of target pest population in the zone was not uniform in the time series, Large, there may be outbreaks of disaster; and Pest community pest population changes more stable, less prone to disaster. The spatial niche breadth of Bemisia tabaci was no significant difference among treatments.