摘要
为了研究白蛾周氏啮小蜂对侵入性害虫———美国白蛾的控制作用 ,在山东省烟台市美国白蛾发生区 ,选择美国白蛾发生程度中等的两块样地 ,一块样地作为释放白蛾周氏啮小蜂防治美国白蛾的防治区 ,另一块样地作为对照区。应用生命表技术 ,连续 2年共 4代对美国白蛾种群数量进行定点观察。防治区每代美国白蛾在化蛹初期和化蛹盛期各放蜂 1次 ,即每代美国白蛾共放蜂 2次。将 2年的第 1代和第 2代观测数据分别综合平均 ,制成 4个生命表。结果表明 ,在放蜂防治区 ,第 1代和第 2代美国白蛾的种群趋势指数 (I)分别为 0 2 9和 0 14,说明下代美国白蛾种群数量将急剧下降 ;放蜂区的I值显著小于对照区的 8 74和 4 48。生命表研究结果清楚地表明 ,通过人工释放白蛾周氏啮小蜂能够达到良好的控制美国白蛾的效果。
In order to evaluate biocontrol effect of an invasive pest,the fall webworm Hyphantria cunea, by the parasitoid Chouioia cunea(Hymenoptera: Eulophidae), life tables of four generations of the pest were consecutively studied for two years in Yantai, Shandong Province. Two experimental sites were selected where the fall webworm was still a big problem but not so serious as some years ago. In one of the sites the parasitoid was released twice in each fall webworm generation , at the beginning and peak period of pupation, while the other site served as the control. The average data of observations for the 1st generations of the fall webworm in two years were combined to make one life table for the test site and the average data of the observations for the 2nd generation of fall webworm were used to make another life table. Similarly, the average data of observations from the control site were used to make two other life tables. The results show that the trend indexes of population (I-value) of 1st and 2nd generations of the fall webworm at the test site, 0.29 and 0.14 respectively, were significantly lower than that at the control site, 8.74 and 4.48 respectively. The pest population clearly declined at the test site and appeared to have been effectively controlled by the parasitoid.
出处
《昆虫学报》
CAS
CSCD
北大核心
2003年第3期318-324,共7页
Acta Entomologica Sinica
基金
国家杰出青年科学基金项目 ( 396 2 5 0 2 0 )
原国家林业部重点课题 ( 96- 5 2 )
