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近年来已查明:蔗田中螟卵赤眼蜂自然种群的盛衰,往往依存于田间自然寄主卵的数量消长。从蔗螟自然种群密度控制的关键因素分析,我们设想:在螟卵低落期,人工补充寄主卵,以及改革施药方式,有可能解决蔗螟卵赤眼蜂自然寄生率下降问题,进而自然抑制螟害。经近几年探索试验,取得良好效果,1984年进一步获得成功。兹将1984年试验结果,总结如下。一、材料、方法以番禺县良种场为基点。沙围田类型;面积191亩;连作及轮作田各半;品种为“粤糖57/423”。试验于4月1日开始。对照区设于邻近前锋大队第10生产队的同类型蔗田,共110
In recent years, it has been ascertained that the natural population of Trichogramma ostriniae in the field of cane field has its own decline and decline, which often depends on the number of natural host eggs in the field. From the analysis of the key factors of natural population density control of sugarcane borer, we assume that the artificial replenishment of the host eggs and the reforming of pesticide application in the low stage of the borer may solve the problem of the natural parasitism declining of the sugarcane borer, and then natural inhibition Pest damage. After several years of exploration test, achieved good results, further success in 1984. The 1984 test results are summarized below. First, materials, methods Panyu County, good seed market as the starting point. Sand field type; an area of 191 acres; even for the crop rotation and cropland half; varieties of “Guangdong sugar 57/423.” The trial started on April 1. The control area is located at the same type of sugar cane fields adjacent to the 10th production unit of the Forces Brigade, a total of 110