Effect of the CDC light trap on control of nocturnal mosquitoes in coastal Samut Songkhram Province, Thailand

Chaiphongpachara, Tanawat; Laojun, Sedthapong; Kunphichayadecha, Chaekki

doi:10.13057/biodiv/d190522

Cited by 10 publications

(7 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Bashar and Tuno 35 reported also not finding any significant correlation between temperatures with mosquito density, but they found a positive association with relative humidity. Other authors found similar findings in their study 36,37 . In contrast, it was reported by Opayele et al 38 that fluctuations in relative humidity were not significantly correlated with mosquito vectors abundance in Ibadan, Nigeria.…”

Section: Discussionsupporting

confidence: 85%

Field assessment of 4-hydroxycoumarin as an attractant for anthropophilic Anopheles spp. vectors of malaria in Madagascar

Andrianjafy

Ramanandraibe

Andrianarijaona

et al. 2020

Sci Rep

View full text Add to dashboard Cite

Mosquito-borne diseases like malaria are a major public health problem in tropical countries, such as Madagascar. Female Anopheles mosquito vectors the human malaria parasites (Plasmodium spp.) and is important indicator in malaria surveillance activities. Among the various means of vector control in Madagascar, the use of attractants for mass trapping of target species could be an alternative to insecticides. The aim of this study is to evaluate whether 4-hydroxycoumarin can be used as an attractant for anthropophilic Anopheles spp. vectors of malaria. For this, a field study was conducted using CDC light traps in the village of Ambohidray, Madagascar. 16 days of trapping was conducted and four replicates nights were performed for each product tested. 4-hydroxycoumarin, octenol and two types of blend of these products were tested. The results showed that 4-hydroxycoumarin (2 mg) have a significant attractive effect on Anopheles spp. and significant selectivity towards Anopheles gambiae s.l, and Anopheles mascarensis which are both significant malaria vectors in Madagascar. A synergy of 4-hydroxycoumarin with octenol was found to attract these mosquito vectors. A significant decrease in vector populations was observed during this experiment. These results suggest that 4-hydroxycoumarin could be useful for malaria surveillance and the control of vector populations. Mosquito-borne diseases present a major public health threat in tropical and subtropical areas and disproportionately impact developing nations, such as Madagascar 1. Among numerous mosquito vectors existent in Madagascar several Anopheles species are responsible for the transmission of malaria parasites 2-4. Due to their distribution, malaria is endemic to 90% of the country 5 and is the fourth leading cause of death in Madagascar 6. In order to limit the transmission of malaria, several methods of control have been implemented such as the use of long lasting insecticide-treated mosquito nets (LLINs) 7 , and indoor residual spraying (IRS) 8 to protect populations in regions with a high potential for epidemics 9. These control methods have shown significant efficacy, but they are also insufficient in the long term due to the rapid amplification of insecticide resistance in vector populations 10,11. In addition, controlling mosquito populations through the use of larvicides and adulticides has found to have negative impacts on ecosystems 12-14. For these reasons, the explorations of other more sustainable and environmentally friendly alternatives are encouraged worldwide 15,16. The use of attractants for selective and mass trapping has been suggested as a promising complementary to insecticide for malaria vector surveillance, control and reduction 17-19. A recent study has shown that 4-hydroxycoumarin, a compound derived from coumarin, a natural substance of plant origin, has a significant attractiveness activity on the mosquito Aedes albopictus, a mosquito vector of Dengue and Chikungunya, in

show abstract

Section: Discussionsupporting

confidence: 85%

Field assessment of 4-hydroxycoumarin as an attractant for anthropophilic Anopheles spp. vectors of malaria in Madagascar

Andrianjafy

Ramanandraibe

Andrianarijaona

et al. 2020

Sci Rep

View full text Add to dashboard Cite

show abstract

“…Although characters used in the morphological analysis are the gold standard method for mosquito species identification, Culex species are difficult to distinguish in the field due to target organ damage by mosquito traps such as CDC light trap [16] and black light (UV) trap [17]. Geometric morphometrics are new techniques that have been used as an alternative for identification [18,19].…”

Section: Resultsmentioning

confidence: 99%

Effectiveness of landmark- and semi-landmark-based geometric morphometric to identify four species of Culex mosquitoes in Thailand

Chaiphongpachara

Laojun

2019

J Adv Vet Anim Res

Self Cite

View full text Add to dashboard Cite

Objective:This research aims to study the effectiveness of landmark- and semi-landmark-based geometric morphometric (LMSL) in the identification of four Culex vectors, namely, C. quinquefasciatus, C. visnui, C. sitiens, and C. whitmorei in Thailand and also compared the potential between LMSL and the landmark-based geometric morphometric method (LM).Materials and Methods:The overall size of the wing sample was estimated by the centroid size. Shape variables were computed as principal components of the “partial warp” calculated after generalized procrustes analysis of raw coordinates. Discriminant analysis of the canonical variables performed to explore the shape dissimilarity between Culex species has been shown as a factor map and to calculate the Mahalanobis distance. Size and shape differences based on pairwise Mahalanobis distances were tested using non-parametric methods (1,000 cycles) with Bonferroni correction at a p-value of <0.05.Results:A total of 120 individuals were used that were divided into 30 individuals per Culex species. The mean CS of C. sitiens had the largest wings followed by C. visnui, C. quinquefasciatus, and C. whitmorei in LM and LMSM. The patterns of statistical difference in CS of both methods were similar and wing shapes among Culex species were different based on a comparison of pairwise Mahalanobis distances (p < 0.05) in both methods. For the cross-validated reclassification test, LM provided Culex species separation ranging from 54% to 84% and 51% to 93% for LMSM.Conclusion:Thus, LMSM is another option to use for the identification in mosquito vectors that have a curved line on the wing specific to the species.

show abstract

“…Different species of Anopheles have different epidemiological characteristics, behaviors, and susceptibility to Plasmodium species and insecticides [7]. Therefore, an understanding of the biology and ecology of malaria vectors in the area of interest is critical for successful disease control [8–10].…”

Section: Introductionmentioning

confidence: 99%

Environmental Factors Associated with Mosquito Vector Larvae in a Malaria-Endemic Area in Ratchaburi Province, Thailand

Chaiphongpachara

Yusuk

Laojun

et al. 2018

The Scientific World Journal

Self Cite

View full text Add to dashboard Cite

Malaria is transmitted by female mosquitoes in the genus Anopheles and is a major public health issue. Different species of Anopheles mosquitoes have different epidemiological characteristics, behaviors, and ecological requirements, and so an understanding of their biology and ecology in a particular area is critical for successful disease control. The aim of this study was to determine which environmental factors are associated with Anopheles larvae in a malaria-endemic area in Ratchaburi Province, Thailand, which shares a border with Myanmar. In October 2016, we collected mosquito larvae and measured six environmental factors at 10 study sites located along Lam Pachi River, which flows through Huay Nam Nak village in Ratchaburi Province. We found two species of Anopheles larvae (An. subpictus sensu lato (s.l.) Grassi and An. barbirostris s.l. van der Wulp) at 7 of the 10 study sites, the numbers of which significantly differed between sites (p < 0.05). Pearson correlation analysis showed that the numbers of larvae of both species were significantly positively correlated with the dissolved oxygen level (p < 0.01) and significantly negatively correlated with the width of the river (p < 0.05) and pH (p < 0.01). By contrast, turbidity, water depth, and water temperature were not associated with larval abundance. Mosquito species which belong to genus Anopheles are considered to be of public health and medical importance. Therefore, Anopheles mosquito surveillance and control in the study sites are essential. This information will facilitate vector-borne disease control and improve our understanding of the biology of Anopheles vectors in rivers located along international borders, further reducing the number of patients in this malaria-endemic area.

show abstract

Effect of the CDC light trap on control of nocturnal mosquitoes in coastal Samut Songkhram Province, Thailand

Cited by 10 publications

References 18 publications

Field assessment of 4-hydroxycoumarin as an attractant for anthropophilic Anopheles spp. vectors of malaria in Madagascar

Field assessment of 4-hydroxycoumarin as an attractant for anthropophilic Anopheles spp. vectors of malaria in Madagascar

Effectiveness of landmark- and semi-landmark-based geometric morphometric to identify four species of Culex mosquitoes in Thailand

Environmental Factors Associated with Mosquito Vector Larvae in a Malaria-Endemic Area in Ratchaburi Province, Thailand

Contact Info

Product

Resources

About