基于性信息素诱捕的广东草地贪夜蛾发生动态及多生物防治因子组合对其控制效果评价

Occurrence dynamicsbased on sexpheromone trapping and control effect evaluated of multiple combination of biological control factors on Spodoptera frugiperda in the field of Guangdong

采用性信息素诱捕器对广东省佛山市、茂名市、韶关市和梅州市的草地贪夜蛾Spodoptera frugiperda发生动态进行监测;以清水作为空白对照,以20%氯虫苯甲酰胺为药剂对照,评价了螟黄赤眼蜂Trichogramma chilonis、螟黄赤眼蜂+苏云金杆菌、螟黄赤眼蜂+金龟子绿僵菌、螟黄赤眼蜂+莱氏绿僵菌、螟黄赤眼蜂+爪哇棒束孢菌、螟黄赤眼蜂+甘蓝夜蛾核型多角体病毒、螟黄赤眼蜂+蠋蝽、螟黄赤眼蜂+蠋蝽+甘蓝夜蛾核型多角体病毒这8种生防措施对玉米田草地贪夜蛾的防控效果。结果表明,草地贪夜蛾在所监测的4个地市全年均有发生,其中佛山监测点的草地贪夜蛾诱捕量高于其它3个监测点,并具有1个明显的发生高峰期(2019年10月中旬至11月中旬),高峰期与玉米种植面积呈正相关。田间生防试验结果表明,单一释放螟黄赤眼蜂或与其他生防因子联合使用均对草地贪夜蛾有一定的控制作用,处理7 d后的防虫效果为54.87%~76.49%,其中以螟黄赤眼蜂+甘蓝夜蛾核型多角体病毒及螟黄赤眼蜂+蠋蝽+甘蓝夜蛾核型多角体病毒的防治效果最好,防效分别为76.49%及71.56%,但均低于氯虫苯甲酰胺的防虫效果(94.60%);但14 d后,20%氯虫苯甲酰胺的防虫效果下降至78.51%,而螟黄赤眼蜂+甘蓝夜蛾核型多角体病毒及螟黄赤眼蜂+蠋蝽+甘蓝夜蛾核型多角体病毒的防效呈上升趋势,防效分别为81.31%与83.35%,具有较好的持续性与稳定性,是防治玉米草地贪夜蛾的理想生物防治组合。研究结果为了解广东草地贪夜蛾的发生规律及综合防控提供了相关科学依据与技术支撑。

A sex pheromone traps was used to monitor the adult population dynamics of S.frugiperda in Foshan,Maoming and Shaoguan and Meizhou.To evaluate control effect of Trichogramma chilonis,T.chilonis+Bacillus thuringiensis,T.chilonis+Metarhizium anisopliae,T.chilonis+Metarhizium rileyi,T.chilonis+Isaria javanicus,T.chilonis+MbMNPV,T.chilonis+Arma chinensis,T.chilonis+A.chinensis+MbMNPV on S.frugiperda with water used as blank control,chlorantraniliprole 20%used as pesticide control.The results suggested that S.frugiperda occurred all year round in the four monitoring points.The amount of S.frugiperda of Foshan monitoring site was higher than that of the other three monitoring points.Foshan witnessed a obvious fastigium of population quantity of fall armyworm(from mid-October to mid-November,2019),and the fastigium was positively correlated with corn planting area.The results of field biological control tests showed that the single released A.chinensis or combined with other biological control factors had certain control effect on S.frugiperda.After 7 days of treatment,the pest control effect was 54.87%~76.49%.Among them,T.chilonis+MbMNPV and T.chilonis+A.chinensis+MbMNPV had the best control effect,the control effect were 76.49%and 71.56%.However,they were all lower than that of chlorantraniliprole(94.60%).But the control effect of chlorantraniliprole reduced to 78.51%after 14 d.The control effect of T.chilonis+MbMNPV and T.chilonis+A.chinensis+MbMNPV were on the rise to 81.31%and 83.35%,respectively which with good durative and stability.They are ideal biological control combination for controlling S.frugiperda.The results provide scientific basis and technical support for understanding the occurrence regularity and comprehensive prevention and control of S.frugiperda in Guangdong.