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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。
To investigate the best time to control Japanese cockroaches, ecological behavior was observed. Results: It was found that population density of Japanese cockroaches in northern China had two peaks throughout the year, beginning in June and August respectively. Adults were predominant in early June and nymphs in August. Conclusion: The best time to effectively control the population density of Japanese cockroaches in northern China is from the end of May to the end of June, that is, the pre-oviposition of Japanese cockroaches.