摘要:
以海南西部甘蔗地与宿根甘蔗撩荒地的东亚飞蝗为对象,应用烟雾载药技术进行田间防治试验,施药量1500～3000mL·hm-2,采用样框法和目数法相结合调查药效,以罩笼法试验作旁证。罩笼结果表明,第3天虫口减退率达92.75%～100%;田间小区试验表明,在施药1d后蝗虫种群急剧减少,第7天虫口减退率达62.51%～95.87%,第15天校正防效维持在61.00%～82.61%之间,高于常规喷雾的40.32%～46.23%。在田间小区试验成功后,进行了1700hm2的大田推广试验,在1500～3000mL·hm-2施药量条件下,药后7d虫口减退率达78.27%～97.52%。烟雾载药技术可用于甘蔗地和宿根甘蔗撩荒地东亚飞蝗大发生时地面应急防控。
Abstract:
Hot fogging concentrate （1 500—3 000 mL·hm-2） were used to control Locusta migratoria manilensis （Meyen） in abandoned land and sugarcane grassland in the western in Hainan island,the method of sampling basket combining with visual counting were used to investigate its efficacy,and the testing inside the cages was used as circumstantial evidence. The cage test results indicated that the reduced rate of revision insects was 92.75%—100% at the 3rd day; The field plot test results indicated the population declined significantly after 1 day,reduced by above 62.51%—95.87% after 7 days,and the control efficacy maintained between 62.38%—82.51% after 15 days,while CK was only 40.32%—46.23%. The results of extra 1700 hm2 field trials showed the locusta population reduced 78.27%—97.52% after 7 days under the dose of 1 500—3 000 ml·hm-2. These data suggested that applying hot fogging concentrate could be used for the urgent controlling of grasshoppers.
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