【摘要】 为探讨控制日本大蠊的最佳时机，进行了生态习性观察。结果：发现北方地区日本大蠊种群密度全年有两个高峰，分别在6月初和8月份；6月初以成虫为主，8月则以若虫为主。结论：经现场杀灭试验，认为北方地区有效控制日本大蠊种群密度的最佳时机为每年的5月下旬至6月，即日本大蠊产卵前期。更多还原

【Abstract】 By observations on the bionomics of Periplaneta japonica, we discovered that duringJune to August its population density is the highest in northern China. In June it is imago and in Augustit is mainly larvae. By the field insecticide experiment, we found that the optimal time for effective control of Periplaneta japonica is in May to June in northern China.更多还原