植保无人机释放赤眼蜂球防治二化螟的效果

Research on the control effect of drone dropping Trichogramma balls on Chilo suppressalis

为探索植保无人机释放赤眼蜂防治害虫的技术,2021年在湖南省永州市零陵区开展了利用植保无人飞机释放赤眼蜂球防治水稻越冬代二化螟研究。结果表明,在准确观测二化螟发育进度的基础上,利用植保无人飞机从水稻分蘖与二化螟成虫孵化产卵初期开始,间隔7 d分3次释放赤眼蜂,每次放蜂1万头/667m^(2),对田间二化螟卵的寄生率达80%以上。在虫害发生稳定期调查,稻螟赤眼蜂和螟黄赤眼蜂释放区水稻平均枯鞘率为1.22%和1.46%,明显低于农户自防区和不防治对照区,对应防效分别达83.22%和80.05%,实现了不使用化学农药有效控制二化螟为害。

To explore the technology of UAV releasing Trichogramma for pests control,we carried out a study in a rice field in Lingling District of Yongzhou City in Hunan Province,2021.With the accurate observation of the development progress of Chilo suppressalis,ball-packed Trichogramma was dropped by drone three times every seven days from the early stage of C.suppressalis adults oviposition and rice tillering.With the release of 10,000 individuals per 667 m^(2)each time,more than 80%of C.suppressalis eggs in the field were parasitized.The average dead sheath rate during the stable period of pest occurrence was 1.22%in the Trichogramma japonicun Ashmead released area and was 1.46%in the Trichogramma chilonis Ishii released area,which was significantly lower than that of the control managed by the farmers(5.17%)and the non-controlled area(7.27%).The corresponding control effect of T.japonicun and T.chilonis treatment reached 83.22%and 80.05%,respectively,which achieved the effective control of the damage caused by the C.suppressalis without chemical pesticides.This technique showed great potential for reducing pesticide consumption,providing an option for green prevention and control of C.suppressalis.