关键词: 德国小蠊, 优势种, 防治

Abstract: Objective To understand the population structure and the dominant species of cockroaches in Nanchang city nowadays,and to explore the control effect of different control methods.Methods The sticky paper with trapped cockroaches was used to investigate the population structure of cockroaches.The control effect of spray,poison bait and toxic powder on Blattella germanica was tested according to the methods of GB.Results Compared to 2001,the infestation of cockroaches was much heavier nowadays.B.germanica was the absolutely dominant species,which accounted for 99.68% of the total cockroaches.The proportions of B.germanica in the restaurant,hotel,hospital and resident areas were 99.72%,99.81%,95.00% and 92.11% respectively,and there was only B.germanica in the agriculture market.The results suggested that d-cyphenothrin had good effect on B.germanica than lambda-cyhalothrin and alphamethrin.In addition,3 poison baits tested had all good effects,among which sanyecao was the best one,which the LT₅₀ and the mortality rate at 96 h were 0.08 d and 100%,respectively.Moreover,the mortality rate of two different poison powders were all 100%.Conclusion B.germanica was the dominant species in Nanchang city.The residual spray of d-cyphenothrin,lambda-cyhalothrin and alphamethrin could control it very well,and the poison baits and toxic powders also had good control effect on it.