Abstract: Objective To investigate the laboratory efficacy (killing effect, chain-killing effect, and the effect of food source on chain-killing effect) against Blattella germanica of four cockroach-killing gel baits (2.15% imidacloprid gel bait, 1.00% chlorpyrifos gel bait, 0.50% dinotefuran gel bait, and 0.05% fipronil gel bait) of the same brand. Methods According to the national standard methods (GB/T 13917.7-2009), the laboratory efficacy of the four gel baits was tested; the chain-killing effect was tested by feeding live cockroaches with dead ones killed by the gel baits; the influence of food source on chain-killing effect was tested by feeding live cockroaches with bait-killed cockroaches mixed with cat food. The data were recorded in Excel 2007 software. DPS V 9.01 software was used to calculate the median lethal time (LT₅₀), 95% confidence interval (CI), and toxicity regression equation of B. germanica, and the significance of LT₅₀ was analyzed, if 95% CI of LT₅₀ ratio of two baits included 1, there was no significant difference in LT₅₀ between the two baits. Results In the laboratory efficacy test, the LT₅₀ values of 2.15% imidacloprid gel bait, 1.00% chlorpyrifos gel bait, 0.50% dinotefuran gel bait, and 0.05% fipronil gel bait were 2.823 9 (2.581 8-3.079 0) d, 0.745 5 (0.603 4-0.890 3) d, 0.793 5 (0.630 9-0.959 3) d, and 0.846 5 (0.464 7-1.228 0) d, respectively; only the imidacloprid group showed significant differences from the other three groups (95% CI of LT₅₀ ratio of two baits did not include 1). In the chain efficacy experiment, the mortality rate on day 30 was >98.00% for all the four baits; the LT₅₀ values of the four gel baits were 6.012 4 (5.229 7-6.754 5) d, 2.459 0 (1.982 1-2.940 2) d, 3.654 1 (3.150 1-4.145 6) d, and 4.589 3 (4.064 6-5.088 8) d, respectively; multiple comparisons showed significant differences between any two baits (95% CI of LT₅₀ ratio of two baits did not include 1). After adding cat food for all the four baits, the chain-killing effect was significantly weakened, the mortality rate was decreased, and the LT₅₀ was increased (95% CI of post-pre LT₅₀ ratio did not include 1); the inhibition ratios were 1.21, 9.80, 2.77, and 2.07 times, respectively. Conclusion The four cockroach-killing gel baits show good laboratory efficacy, and 1.00% chlorpyrifos gel bait, 0.50% dinotefuran gel bait, and 0.05% fipronil gel bait can kill cockroaches quickly. It is necessary to control the interference of food source on the gel bait when control cockroaches. Alternative use of gel baits of different constituents can achieve a better killing effect.

Key words: Cockroach-killing gel bait, Blattella germanica, Killing effect, Chain-killing effect, Imidacloprid, Chlorpyrifos, Dinotefuran, Fipronil

摘要： 目的 研究同一品牌4种不同有效成分杀蟑胶饵对德国小蠊实验室杀灭效果、连锁杀灭效果以及食源对杀灭效果的影响。方法 参照国家标准（GB/T 13917.7－2009）对4种杀蟑胶饵进行室内药效测定；使用胶饵毒杀的虫尸喂食进行连锁灭蟑实验；使用胶饵虫尸混合猫粮进行食源干扰连锁灭蟑实验，测定环境中食源对连锁灭蟑效果的影响。使用Excel 2007软件录入数据，采用DPS V 9.01软件计算德国小蠊半数致死时间（LT₅₀）、95%可信区间（95% CI）和毒力回归方程，并进行LT₅₀的显著性分析。采用2种胶饵LT₅₀比率的95% CI作为其检验方法，包含1，则2种药剂LT₅₀之间差异无统计学意义。结果 室内药效实验中2.15%吡虫啉、1.00%毒死蜱、0.50%呋虫胺和0.05%氟虫腈胶饵的LT₅₀分别为2.823 9（2.581 8~3.079 0）、0.745 5（0.603 4~0.890 3）、0.793 5（0.630 9~0.959 3）和0.846 5（0.464 7~1.228 0）d，仅吡虫啉组与另外3组的差异有统计学意义（2种胶饵LT₅₀比率的95% CI不含1）。4种胶饵毒杀虫尸连锁灭蟑30 d的死亡率均>98.00%，2.15%吡虫啉、1.00%毒死蜱、0.50%呋虫胺和0.05%氟虫腈胶饵毒杀虫尸组的LT₅₀分别为6.012 4（5.229 7~6.754 5）、2.459 0（1.982 1~2.940 2）、3.654 1（3.150 1~4.145 6）和4.589 3（4.064 6~5.088 8）d，4种胶饵毒杀虫尸LT₅₀两两比较差异均有统计学意义（2种胶饵LT₅₀比率的95% CI不含1）。加入猫粮后连锁灭蟑药效明显减弱，死亡率下降，LT₅₀增大，4种胶饵毒杀虫尸连锁灭蟑有无加入猫粮间差异有统计学意义（2种胶饵LT₅₀比率的95% CI不含1），抑制率分别为120.96%、979.86%、276.83%和207.31%。结论 该品牌4种杀蟑胶饵效果良好，1.00%毒死蜱胶饵、0.50%呋虫胺胶饵和0.05%氟虫腈胶饵均能达到快速灭蟑效果。现场灭蟑需要控制食物对胶饵产生的干扰，注意不同药物成分的胶饵交替使用，可达到较好的灭效。

关键词: 杀蟑胶饵, 德国小蠊, 杀灭效果, 连锁灭效, 吡虫啉, 毒死蜱, 呋虫胺, 氟虫腈