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. 2016 Oct 4;10(4):493-500.
eCollection 2016 Dec.

Current Susceptibility Status of Anopheles stephensi (Diptera: Culicidae) to Different Imagicides in a Malarious Area, Southeastern of Iran

Mohammad Amin Gorouhi  1 , Hassan Vatandoost  1 , Mohammad Ali Oshaghi  1 , Ahmad Raeisi  2 , Ahmad Ali Enayati  3 , Hossein Mirhendi  4 , Ahmad Ali Hanafi-Bojd  1 , Mohammad Reza Abai  1 , Yaser Salim-Abadi  5 , Fatemeh Rafi  1
Affiliations

Current Susceptibility Status of Anopheles stephensi (Diptera: Culicidae) to Different Imagicides in a Malarious Area, Southeastern of Iran

Mohammad Amin Gorouhi et al. J Arthropod Borne Dis. .

Abstract

Background: Anopheles mosquitoes are an important group of arthropods due to their role in transmission of malaria. The present study was conducted for determination of susceptibility status of Anopheles stephensi to different imagicides collected from malarious area in Chabahar city, Iran.

Methods: In the present study seven insecticides including: DDT 4%, lambdacyhalothrin 0.05%, deltamethrin 0.05%, permethrin 0.75%, cyfluthrin 0.15% and etofenprox 0.5% were tested based on WHO method. Regression line was plotted for each insecticide using mortality of different exposure times. Bioassay data were analyzed using Probit software and the lethal time for 50% and 90% mortality (LT50 and LT90) values were calculated.

Results: The susceptibility levels of field strain of An. stephensi to the discriminative dose of different imagicides were determined 100, 98, 96, 89, 82 and 62% for etofenprox, permethrin, deltamethrin, lambdacyhalothrin, cyfluthrin and DDT, respectively. Our finding indicated that An. stephensi is resistant to DDT, lambdacyhalothrin and cyfluthrin, and susceptible to etofenprox and permethrin and candidate of resistant to deltamethrin based on WHO criteria.

Conclusion: Our findings indicated that An. stephensi is resistant to DDT and some pyrethroid insecticides which can be developed due to application of insecticides in health and agriculture. These results can provide a clue for future chemical control program in the study area.

Keywords: Anopheles stephensi; Chabahar; Pyrethroid resistance; Susceptibility test.

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Figures

Fig. 1.
Fig. 1.
The map of Chabahar City representing rural districts, Sistan and Baluchistan Province (Study area), Iran
Fig. 2.
Fig. 2.
Regression lines of Anopheles stephensi exposed to different insecticides (field population), 2013
See this image and copyright information in PMC

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