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Herath JMMK, De Silva WAPP, Weeraratne TC, Karunaratne SHPP. Efficacy of the insect growth regulator novaluron in the control of dengue vector mosquitoes Aedes aegypti and Ae. albopictus. Sci Rep 2024; 14:1988. [PMID: 38263389 PMCID: PMC10805727 DOI: 10.1038/s41598-024-52384-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2023] [Accepted: 01/18/2024] [Indexed: 01/25/2024] Open
Abstract
Insect Growth Regulator (IGR) novaluron is an alternative to synthetic neuro-inhibitory insecticides. Present study was designed to assess appropriate dosages of novaluron for dengue vector control. Larvae of Aedes aegypti and Ae. albopictus were exposed to a concentration series of novaluron (Rimon EC10) for two fixed exposure periods of 7-days and 14-days to determined LC50 and LC99 values. Inhibition of adult emergence (IE50 and IE99) was determined by a 14-day exposure. Semi-field experiments were conducted by exposing cohorts of Ae. aegypti larvae to IE99, 2 × IE99 and 10 × IE99 novaluron concentrations in water storage buckets (10 L) and plastic barrels (200 L). For the 7-day exposure, LC50 values were 0.047-0.049 ppm and LC99 were 0.144-0.151 ppm. For 14-day exposure, these values were 0.002-0.005 ppm and 0.006-0.01 ppm respectively. For both species, IE99 was 0.001 ppb under semi-field conditions, and was effective for nearly 2 months. Novaluron concentration 0.01 ppb was effective up to 3 months, with an IE of 89-95%. Authorities should critically review a reduction of the presently recommended field dosage of 200 ppm novaluron by × 100 or more. This would provide the same efficacy but mitigate environmental pollution, development of vector resistance, and financial losses.
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Affiliation(s)
- J M Manel K Herath
- Entomological Surveillance Unit, Office of Regional Director of Health Services, Kurunegala, Sri Lanka
- Postgraduate Institute of Science, University of Peradeniya, Peradeniya, Sri Lanka
| | | | - Thilini C Weeraratne
- Department of Zoology, Faculty of Science, University of Peradeniya, Peradeniya, Sri Lanka
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Canizales CC, Carranza JC, Vallejo GA, Urrea DA. Aedes albopictus distribution in Ibagué, Colombia: Potential risk of arboviral outbreaks. BIOMEDICA : REVISTA DEL INSTITUTO NACIONAL DE SALUD 2023; 43:506-519. [PMID: 38109139 PMCID: PMC10826468 DOI: 10.7705/biomedica.7010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2023] [Accepted: 09/28/2023] [Indexed: 12/19/2023]
Abstract
Introduction Aedes albopictus is a vector for arboviruses, such as dengue, Zika, chikungunya, and yellow fever. The first A. albopictus reports on the American continent date back to 1985. It has spread rapidly throughout Colombia since its first report in 1998 due to its ecological and physiological adaptation capability. Objective To determine A. albopictus distribution in the 13 communes of Ibagué, Colombia. Materials and methods Samples were collected between May and November 2022 in the 13 communes of Ibagué. Vacuum sampling and sweep-netting entomological nets were used in areas with abundant vegetation. The mosquitoes were transported to the Laboratorio de Investigaciones en Parasitología Tropical at the Universidad del Tolima for taxonomic determination. Results We identified 708 A. albopictus specimens distributed throughout Ibague’s 13 communes. The highest vector abundance occurred in communes 10, 11, 7, 8, 2, and 9; communes 3, 4, 5, 6, 12, and 13 had a relative abundance of around 3%, while commune 1 had 2% of relative abundance. Conclusions Aedes albopictus is distributed throughout all the communes of Ibague. Its dispersion has probably been favored by this region’s environmental and social conditions. We recommend annual monitoring of these vectors populations and molecular characterization of the found arboviruses. Ascertaining this mosquito’s distribution throughout the city will enable focusing entomological control strategies and preventing future arbovirus outbreaks.
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Affiliation(s)
| | - Julio Cesar Carranza
- Laboratorio de Investigaciones en Parasitología Tropical, Universidad del Tolima, Ibagué, Colombia.
| | - Gustavo Adolfo Vallejo
- Laboratorio de Investigaciones en Parasitología Tropical, Universidad del Tolima, Ibagué, Colombia.
| | - Daniel Alfonso Urrea
- Laboratorio de Investigaciones en Parasitología Tropical, Universidad del Tolima, Ibagué, Colombia.
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Nie P, Yang R, Cao R, Hu X, Feng J. Niche and Range Shifts of the Fall Webworm ( Hyphantria cunea Dury) in Europe Imply Its Huge Invasion Potential in the Future. INSECTS 2023; 14:316. [PMID: 37103131 PMCID: PMC10141053 DOI: 10.3390/insects14040316] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/25/2023] [Revised: 03/24/2023] [Accepted: 03/24/2023] [Indexed: 06/19/2023]
Abstract
The fall webworm (Hyphantria cunea Dury) has a strong impact on agricultural systems in Europe. However, its invasive potential, which was inherited from its native niche in North America, remains unknown. Here, we investigated the climatic niche and range shifts of the fall webworm in Europe and compared them with those in native North America, then assessed the worms' invasive potential in Europe. Compared with the fall webworm in Europe, those in North America survived in more diverse climatic conditions, which was closely associated with their broader niche and larger potential ranges in Europe. If the fall webworm in Europe could exploit the native niche inherited from those in North America to adapt to climatic conditions in Europe, their potential ranges in Europe could be 5.5-fold those based on the niche as introduced in Europe. The potentially unfilled ranges of the fall webworm in Europe were mainly detected in vast regions of Europe, excluding Norway, Sweden, Finland, North Russia, Hungary, Croatia, Romania, and Ukraine, suggesting that, without strict control, these vast regions might be preferably invaded by the fall webworm in Europe in the future. Therefore, strict control against its invasion is needed. Given that small niche shifts in this invasive insect could result in large range shifts, the niche shifts represent a more sensitive indicator of invasion risk than range shifts.
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Affiliation(s)
- Peixiao Nie
- Division of Plant Ecology, College of Agriculture and Biological Science, Dali University, Dali 671003, China
- Research Center for Agroecology in Erhai Lake Watershed, Division of Plant Ecology, Dali University, Dali 671003, China
- Cangshan Forest Ecosystem Observation and Research Station of Yunnan Province, Division of Plant Ecology, Dali University, Dali 671003, China
| | - Rujing Yang
- Division of Plant Ecology, College of Agriculture and Biological Science, Dali University, Dali 671003, China
| | - Runyao Cao
- Research Center for Agroecology in Erhai Lake Watershed, Division of Plant Ecology, Dali University, Dali 671003, China
| | - Xiaokang Hu
- Division of Plant Ecology, College of Agriculture and Biological Science, Dali University, Dali 671003, China
- Research Center for Agroecology in Erhai Lake Watershed, Division of Plant Ecology, Dali University, Dali 671003, China
- Cangshan Forest Ecosystem Observation and Research Station of Yunnan Province, Division of Plant Ecology, Dali University, Dali 671003, China
| | - Jianmeng Feng
- Division of Plant Ecology, College of Agriculture and Biological Science, Dali University, Dali 671003, China
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Islam MA, Hasan MN, Tiwari A, Raju MAW, Jannat F, Sangkham S, Shammas MI, Sharma P, Bhattacharya P, Kumar M. Correlation of Dengue and Meteorological Factors in Bangladesh: A Public Health Concern. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2023; 20:5152. [PMID: 36982061 PMCID: PMC10049245 DOI: 10.3390/ijerph20065152] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/17/2023] [Revised: 02/20/2023] [Accepted: 02/24/2023] [Indexed: 06/18/2023]
Abstract
Dengue virus (DENV) is an enveloped, single-stranded RNA virus, a member of the Flaviviridae family (which causes Dengue fever), and an arthropod-transmitted human viral infection. Bangladesh is well known for having some of Asia's most vulnerable Dengue outbreaks, with climate change, its location, and it's dense population serving as the main contributors. For speculation about DENV outbreak characteristics, it is crucial to determine how meteorological factors correlate with the number of cases. This study used five time series models to observe the trend and forecast Dengue cases. Current data-based research has also applied four statistical models to test the relationship between Dengue-positive cases and meteorological parameters. Datasets were used from NASA for meteorological parameters, and daily DENV cases were obtained from the Directorate General of Health Service (DGHS) open-access websites. During the study period, the mean of DENV cases was 882.26 ± 3993.18, ranging between a minimum of 0 to a maximum of 52,636 daily confirmed cases. The Spearman's rank correlation coefficient between climatic variables and Dengue incidence indicated that no substantial relationship exists between daily Dengue cases and wind speed, temperature, and surface pressure (Spearman's rho; r = -0.007, p > 0.05; r = 0.085, p > 0.05; and r = -0.086, p > 0.05, respectively). Still, a significant relationship exists between daily Dengue cases and dew point, relative humidity, and rainfall (r = 0.158, p < 0.05; r = 0.175, p < 0.05; and r = 0.138, p < 0.05, respectively). Using the ARIMAX and GA models, the relationship for Dengue cases with wind speed is -666.50 [95% CI: -1711.86 to 378.86] and -953.05 [-2403.46 to 497.36], respectively. A similar negative relation between Dengue cases and wind speed was also determined in the GLM model (IRR = 0.98). Dew point and surface pressure also represented a negative correlation in both ARIMAX and GA models, respectively, but the GLM model showed a positive association. Additionally, temperature and relative humidity showed a positive correlation with Dengue cases (105.71 and 57.39, respectively, in the ARIMAX, 633.86, and 200.03 in the GA model). In contrast, both temperature and relative humidity showed negative relation with Dengue cases in the GLM model. In the Poisson regression model, windspeed has a substantial significant negative connection with Dengue cases in all seasons. Temperature and rainfall are significantly and positively associated with Dengue cases in all seasons. The association between meteorological factors and recent outbreak data is the first study where we are aware of the use of maximum time series models in Bangladesh. Taking comprehensive measures against DENV outbreaks in the future can be possible through these findings, which can help fellow researchers and policymakers.
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Affiliation(s)
- Md. Aminul Islam
- COVID-19 Diagnostic Lab, Department of Microbiology, Noakhali Science and Technology University, Noakhali 3814, Bangladesh
- Advanced Molecular Lab, Department of Microbiology, President Abdul Hamid Medical College, Karimganj 2310, Bangladesh
| | - Mohammad Nayeem Hasan
- Department of Statistics, Shahjalal University of Science and Technology, Sylhet 3114, Bangladesh
| | - Ananda Tiwari
- Department of Health Security, Expert Microbiology Research Unit, Finnish Institute for Health and Welfare, 70701 Kuopio, Finland
| | - Md. Abdul Wahid Raju
- Department of Statistics, Shahjalal University of Science and Technology, Sylhet 3114, Bangladesh
| | - Fateha Jannat
- Department of Public Health, North East University, Sylhet 3100, Bangladesh
| | - Sarawut Sangkham
- Department of Environmental Health, School of Public Health, University of Phayao, Muang District, Phayao 56000, Thailand
| | - Mahaad Issa Shammas
- Department of Civil and Environmental Engineering, College of Engineering, Dhofar University, P.O. Box 2509, Salalah PC 211, Oman
| | - Prabhakar Sharma
- School of Ecology and Environment Studies, Nalanda University, Rajgir 803116, India
| | - Prosun Bhattacharya
- COVID-19 Research, Department of Sustainable Development, Environmental Science and Engineering, KTH Royal Institute of Technology, Teknikringen 10B, SE 10044 Stockholm, Sweden
| | - Manish Kumar
- Sustainability Cluster, University of Petroleum and Energy Studies, Dehradun 248007, India
- Escuela de Ingeniería y Ciencias, Tecnologico de Monterrey, Campus Monterey, Eugenio Garza Sada 2501 Sur, Monterrey 64849, Mexico
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