目的研究美洲大蠊对德国小蠊取食饵料的摄食行为,从食源方面探讨美洲大蠊被德国小蠊逐步取代的原因。方法单纯摄食法和Y型嗅觉仪试验法。结果单纯摄食试验第2~12天,美洲大蠊偏好德国小蠊取食过的饵料,其摄食量是新鲜饵料的1.84倍(P<0.001);试验第14~30天,对德国小蠊取食过和未取食过的饵料摄食量无明显差异(P>0.05)。Y型嗅觉仪试验结果显示美洲大蠊对德国小蠊取食过饵料与未取食过饵料选择性无统计学意义。结论美洲大蠊对德国小蠊取食过的饵料具有一定的取食偏好。 Objective To study the feeding behavior of cockroaches in the cockroach (Blattella germanica) fed with food and explore the reasons of the gradual substitution of cockroaches in the United States with German cockroaches from the aspects of food sources. Methods Simple feeding method and Y-type olfactometer test method. Results On the 2nd to 12th days of simple ingestion test, Periplaneta americana preference was 1.84 times (P <0.001) than that of fresh bait fed on the German cockroach. On the 14th to 30th days, There was no significant difference in food intake between eaten and non-eaten fish (P> 0.05). Y-type olfactometer test results showed that the cockroach on the German cockroach had no preference for feeding bait and non-fed food was statistically significant. Conclusion Periplaneta americana has certain feeding preference to baits fed on German cockroach.