Effects of permethrin at different temperatures on pyrethroid-resistant and susceptible strains of Anopheles
Effects of permethrin at different temperatures on pyrethroid-resistant and susceptible strains of Anopheles
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DOI：
10.1046/j.1365-2915.1999.00198.x
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发表时间：
1999-10-01
影响因子：
1.9
通讯作者：
Curtis, CF
中科院分区：
文献类型：
--
作者：
Hodjati, MH;Curtis, CF
研究了温度（16、22、28、37 摄氏度）对氯菊酯效果的影响，研究了冈比亚按蚊和按蚊的敏感株和拟除虫菊酯抗性株。斯蒂芬斯（双翅目：蚊科）。将未喂食的幼年雌性成年蚊子暴露于 0.25% 氯菊酯试纸或经 500mg a.i./m(2) 氯菊酯处理过的聚酯网中。达到 50% 击倒的时间 (KT50) 随着温度升高而缩短，即拟除虫菊酯的这种效应存在正温度系数。抗性和敏感An之间的抗性比（比较KT50值）。在不同温度下，stephensi 的范围在 2.5 到 4.4 之间。不同菌株的拟除虫菊酯耐受性的比较测试在22-28℃范围内是有效的，但是，当使用区别剂量来检测抗性时，需要更精确的温度控制。Art.的敏感菌株和抗性菌株暴露于0.25％氯菊酯后24小时的死亡率。斯蒂芬西在 16 至 22 摄氏度之间与温度呈负相关，在更高温度下呈正相关。在安.然而，在冈比亚，这种相关性在整个范围内呈正相关。经氯菊酯处理的蚊帐对雌性按蚊的刺激性（以第一次飞行起飞前的时间间隔以及接触 7.5 分钟期间的起飞次数来衡量）在所有四种品系中均与温度呈正相关，并且敏感品系的刺激性比抗性品系的刺激性大得多。
The influence of temperature (16, 22, 28, 37 degrees C) on effects of permethrin was investigated for susceptible and pyrethroid-resistant strains of the mosquitoes Anopheles gambiae and An. stephensi (Diptera: Culicidae). Young unfed female adult mosquitoes were exposed to 0.25% permethrin test papers or to polyester netting treated with permethrin 500mg a.i./m(2). The time to 50% knock-down (KT50) declined as temperature increased, i.e. there was a positive temperature coefficient of this effect of the pyrethroid. Resistance ratios (comparing KT50 values) between resistant and susceptible An. stephensi ranged between 2.5 and 4.4 at the different temperatures. Comparative tests of pyrethroid tolerance of different strains would be valid over the 22-28 degrees C range but, when using a discriminating dose to detect resistance, more precise temperature control is desirable.Mortality 24h after exposure to 0.25% permethrin of both susceptible and resistant strains of Art. stephensi showed a negative correlation with temperature between 16 and 22 degrees C and a positive correlation at higher temperatures. In An. gambiae, however, the correlation was positive over the whole range.Irritancy of permethrin-treated netting to Anopheles females (measured as time lapse until first flight take-off, and the number of take-offs during 7.5min exposure) was positively correlated with temperature in all four strains and was much greater for the susceptible than the resistant strains.