中国水稻科学

中国水稻科学

• 研究简报 • 上一篇    

昆虫病原线虫防治麦田越冬稻象甲的室内研究

陈俊炜 1;张哲涛 2;蒋金炜 2;王世明 2;郭玉杰 3;王念英 3   

  1. 1 河南省郑州市植保植检站，郑州450006； 2 河南农业大学植物保护系，郑州450002； 3 中国农业科学院生物防治研究所，北京100081
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:1996-04-10 发布日期:1996-04-10

Laboratory Test on the Infectivity of Entomopathogenic Nematode, Steinemema feltiae Beijing, to Rice Weevil, Echinonmus squameus, overwintered in Wheat Field

Chen Junwei; Zhang Zhetao; Jiang Jinwei; Wang Shiming; Guo Yujie; Wang Nianying   

  • Received:1900-01-01 Revised:1900-01-01 Online:1996-04-10 Published:1996-04-10

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摘要： 根据郑州郊区稻麦连作区稻象甲以老熟幼虫在麦田内的前稻茬及其周围土壤中越冬的生物学特性，探讨了芜菁夜蛾线虫对越冬的稻象甲幼虫的致病性以及线虫防治稻象甲幼虫的可能性。使用病原线虫防治地下害虫是一种理想的很有前途的生物防治措施芜菁夜蛾线虫对越冬稻象甲幼虫有很强的侵染力，在很短时间内即可使大量稻象甲幼虫死亡。此外，受侵染的稻象甲体内所繁殖的线虫有很强的再侵染能力，因此，一次使用后可长期在田间发挥作用，抑制地下害虫的种群。不同剂量的线虫制剂对稻象甲的致死率不同。一般来说随田间稻象甲幼虫的密度不同，施用线虫制剂后死亡率差异较大。高密度的幼虫使用高剂量的线虫制剂效果好，低密度时低剂量的效果好。大田使用时因根据虫口密度决定线虫剂量。根据大田实际情况，似应以40～80万条/m2的剂量较好。线虫剂量的增加，侵染力也逐渐增加，但达到一定剂量时，其杀虫效果有所下降。

关键词: 生物防治, 稻象甲, 微生物农药, 致病力, 芜菁夜蛾线虫

Abstract: Rice weevil, Echinonmus squameus, is becoming one of major rice insect pest in Yellow valley in Henan province due to the increase of rice cultivating area, new variety deposition as well cropping system changes. The diapause of the weevil occurs at matured larva stage in the rice stubble left in the following winter wheat field. Laboratory test showed that the entomopathogenic nematode, Steinemema feltiae Beijing, has a quite high pathogenicity on the over-wintered weevil larvae and resulted in 96. 7% of the mortality. The reinfection by the killed larva was evaluated and the mortality of re-infected larvae might reach 69% and 83% after 7 and 14 days, respectively. The killed larvae increased from 46.8% to 86.0% with rising the dosage of the nematodes from 100,000/m2 to 150,000/m2. The weevil larva density also significantly influenced the control effectiveness. A better control may be obtained using less nematodes at low larva density and more nematodes at higher larva density.

Key words: biological control, Echinonmus squameus, microbial pesticide, pathogenicity , Stainemema feltiae