Effects of Sodium Chloride on Oviposition Behavior of <i>Aedes albopictus</i>

Jinguji, Hiroshi; Fujiwara, Yuki; Ohtsu, Kazuhisa; Morimoto, Motoko

doi:10.2987/20-6962.1

Cited by 4 publications

(8 citation statements)

References 19 publications

(19 reference statements)

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“…These data indicate that Ae. albopictus mosquitoes have a preference for freshwater to lay eggs, in accordance with previous studies [13,17]. Therefore, freshwater is an effective "lure" in LOs for attracting oviposition of Ae.…”

Section: Discussionsupporting

confidence: 89%

“…As mosquitoes approach an oviposition site, they can use site-specific olfactory cues evaluated with antennal, labrum, and tarsal receptors as short-range signals for continuously perceiving the quality of the site [18]. In the assessment of an oviposition site with NaCl solutions of different concentrations, the related olfactory cues and molecular mechanism are still unclear [13].…”

Section: Discussionmentioning

confidence: 99%

“…Reduction in oviposition above 0.5% NaCl showed that NaCl can be an oviposition repellent for gravid Ae. albopictus females [13]. In order to kill larvae of mosquitoes in cities, in Japan adding salt in tires and other potential habitats is recom-mended, and in Hong Kong and the Philippines sea water is diverted for drainage.…”

Section: Introductionmentioning

confidence: 99%

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An Experimental Evaluation of Toxicity Effects of Sodium Chloride on Oviposition, Hatching and Larval Development of Aedes albopictus

Guo

Zhou

et al. 2022

Pathogens

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Dengue virus, one of the most important mosquito-borne viruses, has shown a sharp upward trend, spreading around the world in recent years. Control of vectors Aedes aegypti and Ae. albopictus remains crucial for blocking dengue transmission. The lethal ovitrap (LO) is one of the cost-effective traps based on the classic “lure and kill” strategy, and finding a proper long-lasting effective toxin is key to achieving the desired effect. The concentration of inorganic salts of habitat environment plays a strong role in affecting oviposition, hatching, and development of mosquitoes, but the potential insecticide activity of Sodium Chloride (NaCl) in habitat water as well as LO still lacks research. In this study, we carried out laboratory experiments to systematically explore the effects of different concentrations of NaCl solutions on oviposition, egg hatching, and larval development of Ae. albopictus. Consequently, Ae. albopictus was found to prefer freshwater to lay eggs; whereas 48.8 ± 2.6% eggs were laid in freshwater and 20% in ≥1.0% brackish water, few eggs were laid in 3.0% NaCl solution. Compared with egg hatching, larval development of Ae. albopictus presented a higher sensibility to NaCl concentration. The mortality of the 3rd–4th larvae in 1.0% NaCl solution was 83.8 ± 8.7%, while in 3.0% it reached 100%. Considering the cumulative effect of NaCl, when NaCl concentration was ≥1.0%, no eggs could successfully develop into adults. These data suggested that NaCl solutions with a concentration ≥1.0% can be used as an effective cheap insecticide for Ae. albopictus in subtropical inland aquatic habitats, and also as the “kill” toxin in LOs. Meanwhile, the concentration range from 0 to 2.0% of NaCl solution has the potential to be used as the “lure” in LOs. The technological processes of how to use NaCl as insecticide or in LOs still needs further in-depth exploration.

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Section: Discussionsupporting

confidence: 89%

Section: Discussionmentioning

confidence: 99%

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An Experimental Evaluation of Toxicity Effects of Sodium Chloride on Oviposition, Hatching and Larval Development of Aedes albopictus

Guo

Zhou

et al. 2022

Pathogens

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“…Saline water with a concentration of 0.5% NaCl has a strong repellent e ect on the oviposition of overwintering eggs of Ae. albopictus (Jinguji et al, 2020). We hypothesized that Ae.…”

mentioning

confidence: 99%

“…Further, a strong negative correlation was observed between the number of eggs deposited by Ae. albopictus females and the NaCl concentration of ovitraps (Panigrahi et al, 2014;Gunathilaka et al, 2017;Jinguji et al, 2020).…”

mentioning

confidence: 99%

Acute toxicity of sodium chloride to first and fourth instar <i>Aedes albopictus</i> larvae

Jinguji

Fujiwara

Ohtsu

et al. 2021

Jap. J. Sanit. Zool.

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e increase in the number of imported cases of dengue fever in Japan is of particular concern as Aedes albopictus is a vector of dengue fever. Due to the potential for insecticide resistance and the impact of insecticides on non-target species, increased attention is being paid to alternative methods of pest control. Placing salt in used tires has been recommended by the Ministry of Health, Labor and Welfare in Japan as a means of controlling mosquitoes. However, the e ectiveness of salt as a larvicide against Ae. albopictus are currently unclear. is study examined the acute toxicity of sodium chloride against rst and fourth larval instars of Ae. albopictus. Acute toxicity tests were conducted according to World Health Organization guidelines. e susceptibility of Ae. albopictus larvae was tested against 0.25%, 0.5%, 0.75%, 1.00%, 1.25% and 1.5% NaCl solutions. Larval mortality was correlated with an increase in NaCl concentration and exposure duration. First instar Ae. albopictus larvae were more sensitive to NaCl than fourth instar, and 72-h LC 90 values for rst and fourth larval instars were 0.49% and 1.01% NaCl, respectively. Our results suggest that the application of 0.5% NaCl to a habitat for 3 days is e ective for Ae. albopictus control.

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An Experimental evaluation of acute toxicity of Sodium Chloride against Aedes aegypti (Linnaeus) larvae

sandhu,

Singh

2024

Preprint

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The prevalence of dengue, one of the most important mosquito-borne diseases, has increased more than eight-fold during the past two decades. The primary and most prevalent mosquito vector, Aedes aegypti L., is responsible for spreading viruses that cause dengue and other harmful diseases. Control of vectors is of particular concern to block dengue transmission. Different chemical measures used for vector control caused various environmental issues, mosquito resistance, resurgence, harmful impacts on non-target organisms increased attention towards cost-effective and environment-friendly control measures. Hence, the present study aimed to check the larvicidal potential of Sodium Chloride (NaCl) and examined its acute toxicity against 4th instar larvae of Ae. aegypti.Acute toxicity tests were conducted as per WHO guidelines. Different NaCl concentrations i.e., 0.5%, 1.0%, 1.5%, 2.0%, 2.5% and 3.0% were prepared using pure NaCl along with distilled water. Larvicidal activity was assessed and toxicity values were computed using Log-Probit Method. Several morphological and behavioral alterations in treated Ae. aegypti larvae were also observed. Sixty percent larvae of Ae. aegypti died after exposing to 1.5% NaCl concentrations within 48 hours and larval mortality significantly increased up to ninety-seven and hundred percent after treatment with more than 2% NaCl solution within 24 and 48 hours respectively. Various ruptures were observed in abdomen and anal papillae along with abnormal behaviour in the treated larvae. Our study concluded that Sodium Chloride can be used as an effective and safe intervention in mosquito control programmes due to its easy availability and less toxicity.

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Effects of Sodium Chloride on Oviposition Behavior of Aedes albopictus

Cited by 4 publications

References 19 publications

An Experimental Evaluation of Toxicity Effects of Sodium Chloride on Oviposition, Hatching and Larval Development of Aedes albopictus

An Experimental Evaluation of Toxicity Effects of Sodium Chloride on Oviposition, Hatching and Larval Development of Aedes albopictus

Acute toxicity of sodium chloride to first and fourth instar <i>Aedes albopictus</i> larvae

An Experimental evaluation of acute toxicity of Sodium Chloride against Aedes aegypti (Linnaeus) larvae

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