Syed Ruhma, Manzoor Farkhanda, Adalat Rooma, Abdul-Sattar Abida, Syed Azka
Department of Zoology, Lahore College for Women University, Lahore, Pakistan.
J Arthropod Borne Dis. 2013 Dec 18;8(1):21-34. eCollection 2014.
The present study was designed to investigate the insecticidal efficacy of four different classes of insecticides: pyrethroids, organophosphates, phenyl-pyrazoles and neo-nicotenoids. One representative chemical from each class was selected to compare the toxicity: deltamethrin from pyrethroids, Dichlorovinyl Dimethyl Phosphate (DDVP) from organophosphates, fipronil from phenyl-pyrazoles and imidacloprid from neo-nicotenoids. The objective of this study was to determine which of these insecticides were most effective against American cockroach.
These insecticides were tested for their LC50 values against Periplaneta americana under topical bioassay method, using different concentrations for each chemical.
Fipronil 2.5% EC was highly effective at all concentrations applied, while DDVP 50% EC was least toxic amongst all. One way analysis of variance confirmed significant differences between mortality of P. americana and different concentrations applied (P< 0.05).
Locality differentiation is an important factor in determining the range of resistance between various localities, as all three localities behaved differently in terms of their levels of resistance.
本研究旨在调查四类不同杀虫剂的杀虫效果：拟除虫菊酯类、有机磷类、苯基吡唑类和新烟碱类。从每类中挑选一种代表性化学物质来比较毒性：拟除虫菊酯类中的溴氰菊酯、有机磷类中的二氯二甲基磷酸酯（敌敌畏）、苯基吡唑类中的氟虫腈和新烟碱类中的吡虫啉。本研究的目的是确定这些杀虫剂中哪种对美洲大蠊最有效。
采用局部生物测定法，对每种化学物质使用不同浓度，测试这些杀虫剂对美洲大蠊的半数致死浓度（LC50）值。
2.5%乳油的氟虫腈在所有施用浓度下都非常有效，而50%乳油的敌敌畏在所有药剂中毒性最低。单因素方差分析证实，美洲大蠊的死亡率与施用的不同浓度之间存在显著差异（P<0.05）。
地域差异是决定不同地区抗性范围的一个重要因素，因为所有三个地区在抗性水平方面表现不同。
