Abstract
Background:
Culiseta longiareolata is an important vector for many human diseases such as brucellosis, avian influenza and West Nile encephalitis. It is likely an intermediate host of avian Plasmodium that can transmit Malta fever. The aim of this study was to determine the susceptibility level of Cs. longiareolata to different classes of imagicides which are recommended by World Health Organization .
Methods:
Larval stages of the Cs. longiareolata were collected from their natural habitats in Marand County at East Azerbaijan Province, northwestern of Iran in 2017. Adult susceptibility test were carried out with using impregnated papers to insecticides including DDT 4%, Cyfluthrin 0.15%, Deltamethrin 0.05%, Propoxur 0.1% and Fenitrothion 1% by standard test kits.
Results:
Results showed that Cs. longiareolata adult is more susceptible to pyrethroid and carbamate insecticides. Among tested insecticides, Cyfluthrin was the most toxic against Cs. longiareolata with LT50 value of 11.53 minutes and Fenitrothion had the least toxic effect (LT50: 63.39 min).
Conclusions:
This study provided a guideline for monitoring and evaluation of insecticide susceptibility tests against Cs. longiareolata mosquitoes for further decision making.
Keywords: Baseline susceptibility, Culiseta longiareolata, Insecticides
Introduction
Mosquitoes transmit many important human diseases such as malaria, filariasis, several types of encephalitis, many arboviral diseases and also cause serious nuisance and irritation (1–5). West Nile virus has been detected in 62 mosquito species, including genera of Aedes, Anopheles, Culiseta and Culex in the United State of America (6–9). About 3500 species of mosquitoes reported worldwide, and approximately 64 of those can be found in Iran (10–17). Culiseta longiareolata is a vector for brucellosis, avian influenza and West Nile encephalitis. These mosquitoes are likely an intermediate host of avian Plasmodium and can transmit Malta fever (18, 19). The mosquito Cs. longiareolata is a common and abundant species in many countries of Europe, Africa and also Asia, such as Iran, Albania, Azores, Botswana, Bulgaria, Canary islands, Croatia, Cyprus, Djibouti, Egypt, southern England, Ethiopia, France, Greece, Hungary, India, Iraq, Italy, Jordan, Lebanon, Lesotho, Madeira, Mauritania, Morocco, Namibia, Pakistan, Portugal, Romania, Russia, Slovakia, Somalia, South Africa, Spain, Sudan, Switzerland, Syria, Tajikistan, Tunisia, Turkey, Ukraine and Yemen (1). Eggs and larvae of Cs. Longiareolata is found mostly in tires, so it can be spread across the world through tire trading (20). Culiseta longiareolata is found common in human habitations. The larvae are rarely found in natural waters that are found mostly in temporary pools, rock pools, artificial containers, wooden and metal barrels and tanks built of concrete, which are rich in decaying organic materials (18). Early growth stages larvae of Cs. longiareolata are more found in shallow areas of pools, whereas late growth stages are found deeper areas of the pools (21).
Chemical insecticides such as organophosphates, organochlorine, carbamate, and pyrethroid are principal weapon against both adult and larval stages of mosquitoes vectors (22–24). Increasing and inappropriate use of synthetic insecticides in mosquito control in parallel to pest control agriculture is one of the main causes of increased tolerance and resistance in different species of mosquitoes across the world (25–27). According to reports in recent years, the level of tolerance and resistance of some mosquitoes and other arthropods has increased in some parts of the world which is a major barrier to the success of vector control programs (28–34). In our knowledge, there was no comprehensive study on monitoring the susceptibility level of Cs. longiareolata to various insecticides in the world. The aim of this study was to evaluate the susceptibility of Cs. longiareolata to five common insecticides recommended by World Health Organization.
Materials and Methods
Study area
This study was carried out in Marand County in East Azerbaijan Province, northwestern of Iran. The county located at latitude 38°42′N, longitude 45°76′E and altitude 1342 Meter (Fig. 1).
Fig. 1.
Map showing Iran, highlighting the location of East Azerbaijan Province and Marand County
Bioassay procedure
In this experimental study larval stage of Cs. longiareolata were collected from larval habitats, then all specimens were transferred to insectary of Department of Medical Entomology and Vector Control with 27±1 °C temperature, 12:12 light and dark period and 60±5% of relative humidity. Adult susceptibility test of mosquitoes were carried out using standard impregnated papers insecticides such as DDT 4%, Cyfluthrin 0.15%, Deltamethrin 0.05%, Propoxur 0.1% and Fenitrothion 1%. According to the standard procedures recommended by the World Health Organization (WHO). In brief, twenty-five unfed female mosquitoes were exposed to insecticide-impregnated papers at different exposure interval times, moreover for each different exposure time 4 replicates of mosquitos were used and 2 replicates of 25 adult mosquitoes were considered as controls with untreated papers.
Probit analysis was conducted on mortality data collected after 24 hours exposure to different times of insecticides using Finney’s statistical method to determine the lethal time causing for 50% and 90% mortality (LT50 and LT90) values and their 95% confidence limit of upper and lower confidence levels (35–37). The percentage mortality was calculated and corrections for mortality when necessary were done by Abbot’s formula (38). According to the WHO criteria, the susceptibility level of the mosqueitoes was considered in three classes as susceptible, tolerant and resistant. The mortality between 98–100% was considered as susceptible, less than 90% demonstrated resistance and between 90–97% was determined as resistance candidate (36, 39, 40).
Results
Table 1 and 2 show the probit regression line parameters for females of Cs. longiareolata to different insecticides. In addition, Probit regression lines of insecticides against adult of Cs. longiareolata were drown which showed a linear relationship between mortality and time (Fig. 2).
Table 1.
The Parameters of probit regression line of five insecticides on Culisita longiareolata in Marand County at East Azerbaijan Province, northwestern of Iran, 2017
Insecticide Name | A | B±SE | LT50, (LCL-UCL) 95% C.I. | LT90, (LCL-UCL) 95% C.I. | X2 (df) | P value |
---|---|---|---|---|---|---|
Cyfluthrin | −2.37 | 2.23±0.27 | 9.18 | 32.05 | 4.36 (3) | > 0.05 |
11.53 | 43.37 | |||||
14.27 | 68.03 | |||||
DDT | −4.41 | 2.57±0.32 | 43.35 | 125.78 | 5.8 (3) | > 0.05 |
52.38 | 165.47 | |||||
63.02 | 250.91 | |||||
Deltamethrin | −3.67 | 2.53±0.30 | 23.72 | 70.17 | 6.46 (3) | > 0.05 |
28.79 | 92.24 | |||||
34.8 | 138.22 | |||||
Fenitrothion | −5.01 | 2.78±0.34 | 53.26 | 140.51 | 2.39 (3) | > 0.05 |
63.39 | 183.26 | |||||
75.85 | 274.31 | |||||
Propoxur | −5.85 | 4.04±0.46 | 24.19 | 48.64 | 2.81 (3) | > 0.05 |
28.05 | 58.2 | |||||
32.36 | 74.68 |
A= y-intercept, B= the slope of the line, SE= Standard error
LT50, 95% CI= Lethal Time causing 50% mortality and its 95% confidence interval
LT90, 95% CI= Lethal Time causing 90% mortality and its 95% confidence interval
LCL: Lower Confidence Limit, UCL: Upper Confidence Limit
X2= Heterogeneity about the regression line
df= degree of freedom, p= Represent heterogeneity in the population of tested
Table 2.
Susceptibility level of Culisita longiareolata exposed to different groups of insecticides at diagnostic dose in Marand County at East Azerbaijan Province, northwestern of Iran, 2017
Insecticides | MR±EB* | Resistance status** |
---|---|---|
Cyfluthrin | 95±0.25 | RC |
DDT | 42.5±0.25 | R |
Deltamethrin | 70±0.41 | R |
Fenitrothion | 37.5±0.48 | R |
Propoxur | 87.5±0.48 | R |
Mortality Rate±Error Bar
RC: Resistance Candidate
R: Resistance
Fig. 2.
Regression lines of Culiseta longiareolata exposed to different group of insecticides in Marand County at East Azerbaijan Province, northwestern of Iran, 2017
The LT50 values were 52.38, 28.79, 11.53, 63.39 and 28.05min after treatment with DDT 4%, deltamethrin 0.05%, cyfluthrin 0.15%, fenitrothion 1% and propoxur 0.1%, respectively (Fig. 3). The highest toxicity against Cs. longiareolata was found on cyfluthrin (LT50: 11.53 and LT90: 43.37min) while the lowest toxicity was observed for fenitrothion 1% (LT50: 63.39 and LT90: 183.26min) (Table 1).
Fig. 3.
Lethal time causing 50% mortality of Culiseta longiareolata exposed to different group of insecticides in Marand County at East Azerbaijan Province, northwestern of Iran, 2017
Discussion
The excessive use of synthetic pesticides in agriculture plays an important role in the development of insecticide resistance in arthropods (41, 42). Resistance in medically important arthropods is developing and this is a major problem in their control (43).
Considering the current WHO criteria for insecticide resistance evaluation, Cs. longiareolata is resistant to Fenitrothion, DDT, deltamethrin, propoxur and candidate of resistance to cyfluthrin. Some studies showed that Cs. longiaerolata is resistance to DDT, propoxur, lambda-cyhalotrin and tolerant to malathion and deltamethrin more over LT50 value found as 131.94, 5.21, 17.60, 5.19 and 29.12min for DDT, deltamethrin, lambda-cyhalothrin, malathion and propoxur respectively (43). LT90 value of Cs. longiaerolata for DDT, deltamethrin, lambda-cyhalothrin, malathion and propoxur calculated as 588.13, 29.24, 229.26, 26.69 and 371.76 minutes respectively(41). Our results based on probit regression line showed that adult of Cs. longiareolata is more suseceptible to pyrethroid and carbamate insecticides. LT50 value of this species for DDT, cyfluthrin, deltamethrin, fenitrothion and propoxur calculated as 52.28, 11.53, 28.79, 63.39 and 28.05 minutes respectively. LT90 value found as 165.47, 43.37, 92.27, 183.26 and 58.2 minutes for DDT, cyfluthrin, deltamethrin, fenitrothion and propoxur respectively.
Previous studies reported that Cs. Longiareolata larvae was susceptible to Bacillus sphaericus and B. thuringiensis (44). Some reports showed that the LC50 and LC90 values of Novaluron (Insect Growth Regular) against Cs. longiareolata were reported as 0.51–0.91μg/l and 2.32–4.30μg/l, respectively (45).
In many regions of Iran, results of susceptibility test on Cx. pipiens, Cx. quinquefasciatus, Anopheles stephensi, and Cs. longiareolata showed that high resistant to different classes of insecticides, such as DDT, deltamethrin, lambda-cyhalothrin, propoxur and cyfluthrin and this finding is similar to our results for Cs. longiareolata (29–31, 41, 46, 47).
The lack of data on mosquito susceptibility to insecticides is a limiting factor for the success of control programs. Therefore, this finding can be useful in future vector control programs and investigations in order to prevent the development of resistance to insecticides.
Due to the emergence of resistance in mosquitoes to different classes of insecticides, the use of biological agents can be an effective method to control mosquitoes (42). However, the use of botanical insecticide, which have no adverse effects on the environment and humans, can be appropriate and an alternative control method for insecticide in vector control programs (48–55).
Conclusion
This study confirms the resistance of the Cs. longiareolata to fenitrothion, DDT, deltamethrin, propoxur and candidate of resistance to cyfluthrin. When we observed the high resistance level of Cs. longiareolata increases to the insecticides in the study area, therefore, in order to avoid increasing resistance to insecticides, appropriate and effective strategies should be used such as: use of regular monitoring of current insecticides resistance, interventions in combination, rotations of insecticides, mixtures insecticides and plant insecticides. By using these appropriate methods and by decreasing the level of mosquitoes resistance to insecticides, it could be hopeful to better control the vector-borne diseases in the future.
Acknowledgements
This study was financially supported by the Deputy for Research, Tehran University of Medical Sciences Project no. 35904. The authors declare that there is no conflict of interests.
The authors declare that there is no conflict of interest
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