Multi-insecticide susceptibility evaluation of dengue vectors Stegomyia albopicta and St. aegypti in Assam, India

Particle and Fibre Toxicology

Vijay Veer¹  Sunil Dhiman¹  Bipul Rabha¹  Kavita Yadav¹ 

[1] Defence Research Laboratory, Tezpur 784 001, Assam, India

关键词: Insecticide resistance;    Northeast India;    Dengue vector;    St. aegypti;    St. albopicta;   

Others  :  1146796
DOI  :  10.1186/s13071-015-0754-0

 received in 2014-11-06, accepted in 2015-02-18,  发布年份 2015

【 摘 要 】

Background

Dengue is rapidly expanding mosquito-borne viral infection globally facing operational challenges due to insecticide resistance in dengue vectors. We have studied the susceptibility status of potential dengue vectors St. albopicta and St. aegypti to the commonly used insecticides.

Methods

Stegomyia larval bioassays were carried out to determine LC₁₀, LC₅₀ and LC₉₉ values and resistance ratios (RR₅₀ and RR₉₉) for temephos. Adult susceptibility bioassay to 4% DDT, 0.05% deltamethrin, 5% malathion was assessed following standard procedure to determine the corrected mortality. Knock-down times (KDT₅₀ and KDT₉₉) were estimated and the knock-down resistance ratios (KRR₅₀ and KRR₉₉) were calculated.

Results

St. albopicta wild population (WP) of Sotia was resistant to temephos as the LC₉₉ value was 0.12 mg/l and found to be 2.3 fold high than the reference population (RP). St. aegypti WP of Borgong, Kusumtola and Serajuli displayed a RR₉₉ of 2.5, 5.4 and 4.5 respectively suggesting high level of resistance to temephos. Results suggested that both St. albopicta and St. aegypti WP were fully resistant to DDT (mortality < 90%) in all the study locations. Both the species were completely susceptible to deltamethrin and malathion (corrected mortality > 98%), except for St. albopicta at Sotia which displayed low level of resistance to malathion (corrected mortality =95.4%). The estimated KDT values for both the species indicated high level of knock-down resistance to DDT and susceptibility to deltamethrin.

Conclusion

WP of both the dengue vectors showed varied response to temephos, while resistant to DDT and completely susceptible to deltamethrin. Both the species were susceptible to malathion at majority of the testing sites. Current results strongly advocate that DDT is no longer effective against dengue vectors, while thorough monitoring of malathion susceptibility in geographical area at dengue risk is inexorable to ascertain whether or not the resistance to malathion is focal. Information generated herein may be useful in better planning and implementing in dengue control strategy using insecticides.

【 授权许可】

   
2015 Yadav et al.; licensee BioMed Central.

【 图 表 】

Figure 1.

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