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室内检测了赤眼蜂对其寄主的鳞片提取物（利它素）引起的滞留搜寻时间反应。结果表明:广赤眼蜂对欧洲玉米螟利它素比亚洲玉米螟的滞留搜寻反应时间明显延长（P=0.0001）,并表现出对寄主种类的一定选择性。
Laboratory tests were conducted on the reaction of Trichogramma to the retention time of search caused by its host scale extract (ritodrine). The results showed that the duration of the search for the retention of erythromycin by the Trichogramma ostriniae from the European corn borer was significantly longer than that of the Asian corn borer (P = 0.0001), and showed some selectivity to the host species.