茭白害虫长绿飞虱与稻田缨小蜂关系的研究

茭白害虫长绿飞虱 Saccharosydne procerus是稻虱缨小蜂Anagrus nilaparvatae 在稻田外的主要寄主之一。茭白田可为稻田提供大量的稻虱缨小蜂，从而提高对稻田稻飞虱的控制能力。从褐飞虱和长绿飞虱卵中羽化的稻虱缨小蜂均明显地选择寄生褐飞虱卵，对长绿飞虱卵的寄生率也较高。长绿飞虱在水稻上不能完成其生活史。因此，稻田和茭白田的合理布局可有效地提高稻田缨小蜂的数量，从而提高该寄生蜂对有关害虫的生防效益。

A STUDY ON THE RELATIONSHIP BETWEEN EGG PARASITOID, ANAGRUS NILAPARVATAE AND GREEN SLENDER PLANTHOPPER, SACCHAROSYDNE PROCERUS, A SPECIES OF INSECT PEST OF WILD RICE, ZIZANIA CADUCIFLORA

The green slender planthopper, Saccharosydne procerus (Homeptera:Delphacidae) serves as a major alternate host of the egg parasitoid, Anagrus nilaparvatae, an important biocontrol agent of the rice planthoppers. Zizania caduciflora plants bearing numerous parasitized eggs of S. procerus highly promoted the A. nilaparvatae populations for the neighboring rice field, and efficiently suppressed the occurrence of the rice planthopper. In the free choice test, A. nilaparvatae emerged from eggs of either S. procerus or Nilaparvata lugens preferred N. lugens eggs to S. procerus. The parasitism of S. procerus by A. nilaparvatae exceeded 15%, while S. procerus eggs were alone provided. S. procerus could not complete its life cycle on rice, indicating no significant damage of this planthopper to rice. These results suggested that a proper management of rice and Z. caduciflora fields may enhance the efficiency of egg parasitoid, Anagrus spp. to control both rice planthoppers in rice field and S. procerus in Z. caduciflora field.