Fazeli-Dinan Mahmoud, Habibi Aliasghar, Haghi Seyed Farzad Motevalli, Nikookar Seyed Hassan, Yazdani-Charati Jamshid, Enayati Ahmadali
Department of Medical Entomology and Vector Control, Health Sciences Research Center, Addiction Institute, Faculty of Health, Mazandaran University of Medical Sciences, Sari, Iran.
Department of Medical Entomology and Vector Control, Student Research Committee, Faculty of Health, Mazandaran University of Medical Sciences, Sari, Iran.
Int J Health Sci (Qassim). 2022 Jul-Aug;16(4):13-21.
German cockroach is highly adapted to different environments like hospitals. This pest is an important carrier of pathogenic agents and allergic compounds. Hence, it is important to German cockroaches always be monitored and controlled. This study investigated the toxicity and resistance levels of technical-grade of cypermethrin, propoxur, and fenitrothion against adult males of four strains of the German cockroach.
Four German cockroaches' strains including laboratory-reared susceptible strain (S) and three hospital-collected strains (B, F, and Z) were tested in this study. Adult male cockroaches were treated topically with three technical grade insecticides on the first abdominal segment of the insects using a hand micro-applicator.
Using topical application methods, fenitrothion showed the most toxicity to all four strains. The LD values of fenitrothion in the susceptible strain (S) and the hospital-collected strains B, F, and Z were 1.89, 21.48, 25.73, and 31.55 μg/grBW, respectively. All hospital-collected strains showed different resistant levels to all insecticides. The field-collected Z strain was the most resistant strain to cypermethrin, propoxur, and fenitrothion. The resistance ratios of strain Z to cypermethrin, propoxur, and fenitrothion were 10.9, 10.47 and 16.67, respectively.
Based on the susceptibility and resistance ratios for each insecticide, we conclude that there are high rates of insecticide resistance in from different hospitals of Sari County which can be caused by different insecticides treatment histories.
德国小蠊对医院等不同环境具有高度适应性。这种害虫是病原体和过敏化合物的重要携带者。因此，对德国小蠊进行持续监测和控制非常重要。本研究调查了氯氰菊酯、残杀威和杀螟硫磷原药对四株德国小蠊成年雄虫的毒性和抗性水平。
本研究测试了四株德国小蠊，包括实验室饲养的敏感品系（S）和三株从医院采集的品系（B、F和Z）。使用手动微量移液器，将三种原药杀虫剂局部施用于昆虫腹部第一节的成年雄蟑螂。
采用局部施药方法，杀螟硫磷对所有四个品系的毒性最大。杀螟硫磷在敏感品系（S）以及从医院采集的品系B、F和Z中的致死剂量值分别为1.89、21.48、25.73和31.55μg/克体重。所有从医院采集的品系对所有杀虫剂均表现出不同程度的抗性。野外采集的Z品系对氯氰菊酯、残杀威和杀螟硫磷的抗性最强。Z品系对氯氰菊酯、残杀威和杀螟硫磷的抗性比率分别为10.9、10.47和16.67。
根据每种杀虫剂的敏感性和抗性比率，我们得出结论，萨里县不同医院的德国小蠊对杀虫剂的抗性率很高，这可能是由不同的杀虫剂处理历史造成的。
