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目的测定不同浓度的氟虫腈饵剂对德国小蠊的药效和连锁药效,确定氟虫腈在饵剂中的合理浓度。方法通过健康成虫与取食毒饵后的个体接触测定对成虫的毒性传递,通过健康若虫与取食毒饵后的个体的排泄物接触测定对若虫的毒性传递性。结果氟虫腈饵剂的浓度为0.04%、0.03%、0.02%、0.01%、0.005%、0.002 5%时,60 h内试虫平均死亡率均可达100%,LT50分别为6.74、6.99、7.25、7.84、13.48、16.61 h,饵剂浓度越低,杀灭速度越慢。氟虫腈饵剂浓度高于0.005%时,德国小蠊成虫二次中毒死亡率10 d内可达100%,氟虫腈饵剂浓度高于0.01%时,德国小蠊若虫二次中毒死亡率5 d内可达100%。结论对德国小蠊敏感品系,氟虫腈饵剂浓度高于0.01%时,即有理想的灭治效果和二次传毒效果。
Objective To determine the efficacy and chain efficacy of fipronil bait at different concentrations on German cockroach and determine the reasonable concentration of fipronil in bait. Methods Toxicity transmission to adults was determined by contact of healthy adults with individuals exposed to the bait, and toxicity to nymphs was determined by contact of healthy nymphs with excrement from individuals after the bait was taken. Results The average mortality rates of fipronil bait were 60%, 0.04%, 0.03%, 0.02%, 0.01%, 0.005% and 0.002 5% 7.25,7.84,13.48,16.61 h, the lower the bait concentration, the slower the killing rate. Fipronil bait concentration higher than 0.005%, German cockroach secondary poisoning mortality within 10 d up to 100%, fipronil bait concentration higher than 0.01%, the German cockroach nymph secondary poisoning mortality 5 d up to 100%. Conclusion When the concentration of fipronil bait is higher than that of the susceptible strain of Blattella germanica, there is an ideal killing effect and secondary transmission effect.