Pub Date : 2023-09-30DOI: 10.33307/entomon.v48i3.944
Bendangsenla Longkumer, Pankaj Neog, None Waluniba, H. S. Devi
The Effect of sowing dates and cultivars on the incidence of fall army worm Spodoptera frugiperda (J.E. Smith) and yield attributes of maize (Zea mays L.) was carried out with five cultivars namely, Zarsi (local), Sipho (local), Ronimi (local), Khoi (local) and HQPM-1 (composite) and three different sowing dates (6th March, 21st March and 5th April). Among the different dates of sowing, 6th March recorded maximum pest incidence, while 5th April recorded the least on maize. The interaction between sowing dates and cultivars showed significant effect on the incidence of army worm at different days after sowing. The maize sown on 21st March, recorded the highest grain yield (4.12 t ha-1). It can be suggested that manipulating the sowing date and growing of tolerant variety of maize such as HQPM1 can be an effective measure to manage exotic army worm infestation. Mid sowing of maize (21st March) and growing of local cultivars such as Sipho observed significantly better yield attributes which will ensure higher economic returns to the farmers.
{"title":"Effect of sowing dates and cultivars on incidence of the exotic army worm Spodoptera frugiperda (J.E. Smith) of maize (Zea mays L.)","authors":"Bendangsenla Longkumer, Pankaj Neog, None Waluniba, H. S. Devi","doi":"10.33307/entomon.v48i3.944","DOIUrl":"https://doi.org/10.33307/entomon.v48i3.944","url":null,"abstract":"The Effect of sowing dates and cultivars on the incidence of fall army worm Spodoptera frugiperda (J.E. Smith) and yield attributes of maize (Zea mays L.) was carried out with five cultivars namely, Zarsi (local), Sipho (local), Ronimi (local), Khoi (local) and HQPM-1 (composite) and three different sowing dates (6th March, 21st March and 5th April). Among the different dates of sowing, 6th March recorded maximum pest incidence, while 5th April recorded the least on maize. The interaction between sowing dates and cultivars showed significant effect on the incidence of army worm at different days after sowing. The maize sown on 21st March, recorded the highest grain yield (4.12 t ha-1). It can be suggested that manipulating the sowing date and growing of tolerant variety of maize such as HQPM1 can be an effective measure to manage exotic army worm infestation. Mid sowing of maize (21st March) and growing of local cultivars such as Sipho observed significantly better yield attributes which will ensure higher economic returns to the farmers.","PeriodicalId":87603,"journal":{"name":"Entomon; internationale Zeitschrift fur die gesamte Insektenkunde","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135038370","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-30DOI: 10.33307/entomon.v48i3.951
K.A. Sobhana, T.K. Viswanath, V.D. Hegde
Distribution records of two dung beetle species, Onthophagus orissanus Arrow, 1931 and O. germanus Gillet, 1927, from south India is provided. O. orissanus is reported for first time from south India and O. germanus is reported for the first time outside the moist south Western Ghats from the Malabar Coast region in Kerala.
{"title":"Distributional records of Onthophagus germanus Gillet, 1927 and Onthophagus orissanus Arrow, 1931(Coleoptera, Scarabaeidae, Scarabaeinae) from south India","authors":"K.A. Sobhana, T.K. Viswanath, V.D. Hegde","doi":"10.33307/entomon.v48i3.951","DOIUrl":"https://doi.org/10.33307/entomon.v48i3.951","url":null,"abstract":"Distribution records of two dung beetle species, Onthophagus orissanus Arrow, 1931 and O. germanus Gillet, 1927, from south India is provided. O. orissanus is reported for first time from south India and O. germanus is reported for the first time outside the moist south Western Ghats from the Malabar Coast region in Kerala.","PeriodicalId":87603,"journal":{"name":"Entomon; internationale Zeitschrift fur die gesamte Insektenkunde","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135038369","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-30DOI: 10.33307/entomon.v48i3.952
Chaueichongla Phom, Jeyaparvarthi Somasundaram
This study provides important information on the population diversity of edible insects in Tuensang district, Nagaland, India. The region is known for its diverse group of entomofauna, which are used as a healthy food source by the local people. In the study to evaluate the edible insects of Tuensang district, Nagaland, 23 different varieties of insects were identified. The study highlights the importance of these insects as a food source for the local people, which could have implications for food security and sustainability in the region.
{"title":"Diversity of edible insects in Tuensang district, Nagaland, India","authors":"Chaueichongla Phom, Jeyaparvarthi Somasundaram","doi":"10.33307/entomon.v48i3.952","DOIUrl":"https://doi.org/10.33307/entomon.v48i3.952","url":null,"abstract":"This study provides important information on the population diversity of edible insects in Tuensang district, Nagaland, India. The region is known for its diverse group of entomofauna, which are used as a healthy food source by the local people. In the study to evaluate the edible insects of Tuensang district, Nagaland, 23 different varieties of insects were identified. The study highlights the importance of these insects as a food source for the local people, which could have implications for food security and sustainability in the region.","PeriodicalId":87603,"journal":{"name":"Entomon; internationale Zeitschrift fur die gesamte Insektenkunde","volume":"218 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135038379","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-30DOI: 10.33307/entomon.v48i3.943
Sheema Tabasum, A.A Buhroo
Population fluctuation of Aceria erineus in relation to abiotic factors on different walnut orchards of Kashmir was roving surveyed in 27 agricultural sites in nine districts of Kashmir during May 2018 to April 2019. In each district, three sites were selected randomly and the incidence of the mite was recorded at fortnightly intervals throughout the crop growth period. Field surveys indicated the presence of the pest in the entire surveyed region in varying intensity with maximum incidence recorded in Kupwara (21.77±1.39 mites per leaf), Baramulla (19.27±1.09 per leaf), Shopian (18.4±2.47 per leaf), Budgam (18.33±1.24 per leaf) and Pulwama (18.24±1.75 per leaf) respectively. Significant positive correlations of mite populations with minimum temperature were found in Shopian and all the districts of north Kashmir. Significant negative correlation was also found between mite population and rainfall except Anantnag district where it was non-significant. Maximum and minimum temperatures as well as sunshine hours had non-significant positive correlation, whereas relative humidity had non-significant negative correlation with the mite population.
{"title":"Seasonal population dynamics of Aceria erineus (Nalepa) (Acari: Eriophyidae) on Walnut trees in Kashmir","authors":"Sheema Tabasum, A.A Buhroo","doi":"10.33307/entomon.v48i3.943","DOIUrl":"https://doi.org/10.33307/entomon.v48i3.943","url":null,"abstract":"Population fluctuation of Aceria erineus in relation to abiotic factors on different walnut orchards of Kashmir was roving surveyed in 27 agricultural sites in nine districts of Kashmir during May 2018 to April 2019. In each district, three sites were selected randomly and the incidence of the mite was recorded at fortnightly intervals throughout the crop growth period. Field surveys indicated the presence of the pest in the entire surveyed region in varying intensity with maximum incidence recorded in Kupwara (21.77±1.39 mites per leaf), Baramulla (19.27±1.09 per leaf), Shopian (18.4±2.47 per leaf), Budgam (18.33±1.24 per leaf) and Pulwama (18.24±1.75 per leaf) respectively. Significant positive correlations of mite populations with minimum temperature were found in Shopian and all the districts of north Kashmir. Significant negative correlation was also found between mite population and rainfall except Anantnag district where it was non-significant. Maximum and minimum temperatures as well as sunshine hours had non-significant positive correlation, whereas relative humidity had non-significant negative correlation with the mite population.","PeriodicalId":87603,"journal":{"name":"Entomon; internationale Zeitschrift fur die gesamte Insektenkunde","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135038381","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-30DOI: 10.33307/entomon.v48i3.938
B. Deepti, J. Pathma
The biology and fitness of Helicoverpa armigera (Hubner) was studied on bottle gourd, lady’s finger, chilli and tomato. The total larval duration was found to be 20, 22.5, 20.3 and 18.3 days on tomato, chilli, lady’s finger and bottle gourd respectively. The total life cycle was of 35.25, 40.7, 34.2 and 31.3 days on tomato, chilli, lady finger and bottle gourd respectively. Shortest life cycle was observed on bottle gourd and longest on chilli. Feeding preference and fitness of H. armigera revealed that it preferred bottle gourd over other host plants. On bottle gourd, the pest recorded highest mean larval weight gain (0.112g/ day), while the lowest was on chilli (0.090g/ day). The feeding period was 8.073 days on bottle gourd and 8.266 days on chilli. Average food ingested on bottle gourd, lady finger, chilli and tomato were 3.083, 2.347, 2.076 and 1.988g respectively. Bioefficacy of botanicals (5 % aqueous extracts of periwinkle, giloy, tulsi and lantana) against H. armigera by leaf dip bioassay using leaves of tomato showed that the average food ingested in periwinkle, giloy, tulsi, lantana and control was 0.644, 0.944, 1.038, 0.985 and 2.297g respectively. This is the first report evidencing the insecticidal properties of aqueous extracts of giloy against H. armigera.
{"title":"Studies on biology and preference of Helicoverpa armigera (Hubner) on different host plants and evaluation of botanicals for its management","authors":"B. Deepti, J. Pathma","doi":"10.33307/entomon.v48i3.938","DOIUrl":"https://doi.org/10.33307/entomon.v48i3.938","url":null,"abstract":"The biology and fitness of Helicoverpa armigera (Hubner) was studied on bottle gourd, lady’s finger, chilli and tomato. The total larval duration was found to be 20, 22.5, 20.3 and 18.3 days on tomato, chilli, lady’s finger and bottle gourd respectively. The total life cycle was of 35.25, 40.7, 34.2 and 31.3 days on tomato, chilli, lady finger and bottle gourd respectively. Shortest life cycle was observed on bottle gourd and longest on chilli. Feeding preference and fitness of H. armigera revealed that it preferred bottle gourd over other host plants. On bottle gourd, the pest recorded highest mean larval weight gain (0.112g/ day), while the lowest was on chilli (0.090g/ day). The feeding period was 8.073 days on bottle gourd and 8.266 days on chilli. Average food ingested on bottle gourd, lady finger, chilli and tomato were 3.083, 2.347, 2.076 and 1.988g respectively. Bioefficacy of botanicals (5 % aqueous extracts of periwinkle, giloy, tulsi and lantana) against H. armigera by leaf dip bioassay using leaves of tomato showed that the average food ingested in periwinkle, giloy, tulsi, lantana and control was 0.644, 0.944, 1.038, 0.985 and 2.297g respectively. This is the first report evidencing the insecticidal properties of aqueous extracts of giloy against H. armigera.","PeriodicalId":87603,"journal":{"name":"Entomon; internationale Zeitschrift fur die gesamte Insektenkunde","volume":"130 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135038367","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The Old-World Psyllid, Heterotrioza chenopodii (Hemiptera, Psylloidea, Triozidae) was found infesting quinoa, Chenopodium quinoa (Amaranthaceae) crop. The psyllids were identified using taxonomic traits and further confirmation with mitochondrial marker based molecular approach. The information on damage and its life stages is reported along with the phylogenetic information of the species. The identity, analysis in NCBI indicated that the MT-COI sequences of H. chenopodii were 96 per cent identical to the previously deposited sequences with NCBI and five submissions with accession numbers were made viz., OP735496, OP740826, OP740828, OP740829 and OP740830. The phylogenetic tree represented the similarities in the analyzed sequences Indian populations are found to be merged in between the other similar global populations.
{"title":"Indian record of the old-world psyllid Heterotrioza chenopodii (Reuter) (Hemiptera, Psylloidea, Triozidae) on quinoa Chenopodium quinoa (Amaranthaceae)","authors":"Aishwarya Palanisamy, Murugan Marimuthu, Chitra Narayanasamy, Balasubramani Venkatasamy","doi":"10.33307/entomon.v48i3.935","DOIUrl":"https://doi.org/10.33307/entomon.v48i3.935","url":null,"abstract":"The Old-World Psyllid, Heterotrioza chenopodii (Hemiptera, Psylloidea, Triozidae) was found infesting quinoa, Chenopodium quinoa (Amaranthaceae) crop. The psyllids were identified using taxonomic traits and further confirmation with mitochondrial marker based molecular approach. The information on damage and its life stages is reported along with the phylogenetic information of the species. The identity, analysis in NCBI indicated that the MT-COI sequences of H. chenopodii were 96 per cent identical to the previously deposited sequences with NCBI and five submissions with accession numbers were made viz., OP735496, OP740826, OP740828, OP740829 and OP740830. The phylogenetic tree represented the similarities in the analyzed sequences Indian populations are found to be merged in between the other similar global populations.","PeriodicalId":87603,"journal":{"name":"Entomon; internationale Zeitschrift fur die gesamte Insektenkunde","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135040079","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Proper understanding of ecological dynamics of faunal components, whether it is a large mammal or a tiny insect of any ecosystem including forests, plays an important role in the eco-management of any eco-zone. Dipteran insects constituting a major faunal group among the entomo-diversity of any forest ecosystem portray significant functional roles in determining the stability in the ecosystem functioning of the respective ecosystem. The present paper has attempted to document the diversity of dipteran insects inhabiting a tropical deciduous forest of the extended part of Deccan Biogeographic Zone in the eastern part of India, the Kuldiha Wildlife Sanctuary alongside indicating its habitat preference and distribution patterns. A total of 34 species under 19 families of the order Diptera were recorded from different habitats of the studied forest areas, of which three species are considered new reports from the state of Odisha, India. Out of the three selected eco-zones, the deep forest area having a higher density of sal trees (Shorea robusta) revealed less species richness but high relative abundance, whereas the barren grazing land demonstrated higher species richness with low relative abundance. The eco-zone with wetlands and associated vegetation have shown moderate species richness and diversity of dipteran insects. Three contrasting seasons (pre-monsoon, monsoon, and post-monsoon) of this region have also demonstrated different patterns of diversity and density of this group of insects which have been segregatedinto several feeding guilds in tune with the seasonal availability of food resources.
{"title":"Diversity and distribution of true flies (Diptera) of Kuldiha Wildlife Sanctuary, Odisha, India: Functional roles based on ecological guilds","authors":"Sankarsan Roy, Santanu Ghara, Santu Paria, Prakash Chandra Mardaraj, Susanta Kumar Chakraborty","doi":"10.33307/entomon.v48i3.941","DOIUrl":"https://doi.org/10.33307/entomon.v48i3.941","url":null,"abstract":"Proper understanding of ecological dynamics of faunal components, whether it is a large mammal or a tiny insect of any ecosystem including forests, plays an important role in the eco-management of any eco-zone. Dipteran insects constituting a major faunal group among the entomo-diversity of any forest ecosystem portray significant functional roles in determining the stability in the ecosystem functioning of the respective ecosystem. The present paper has attempted to document the diversity of dipteran insects inhabiting a tropical deciduous forest of the extended part of Deccan Biogeographic Zone in the eastern part of India, the Kuldiha Wildlife Sanctuary alongside indicating its habitat preference and distribution patterns. A total of 34 species under 19 families of the order Diptera were recorded from different habitats of the studied forest areas, of which three species are considered new reports from the state of Odisha, India. Out of the three selected eco-zones, the deep forest area having a higher density of sal trees (Shorea robusta) revealed less species richness but high relative abundance, whereas the barren grazing land demonstrated higher species richness with low relative abundance. The eco-zone with wetlands and associated vegetation have shown moderate species richness and diversity of dipteran insects. Three contrasting seasons (pre-monsoon, monsoon, and post-monsoon) of this region have also demonstrated different patterns of diversity and density of this group of insects which have been segregatedinto several feeding guilds in tune with the seasonal availability of food resources.","PeriodicalId":87603,"journal":{"name":"Entomon; internationale Zeitschrift fur die gesamte Insektenkunde","volume":"99 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135038366","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-30DOI: 10.33307/entomon.v48i3.947
B. Archana, E. Joy Sharmila, K. Rangesh, V. Pandi, S. Susaritha, S. Kalai Selvi
Southern birdwing Troides minos (Cramer, [1779]), a large swallow tail butterfly, state butterfly of Karnataka, is endemic to south India. T. minos was listed in CITES (Convention on International Trade in Endangered species of wild fauna and flora) and is of high conservation priority. IUCN also recommends close monitoring of T. minos. The population trend of T. minos, in Sirumalai Reserve Forest, Eastern Ghats was monitored for the period of twenty six months using the line transect method. Higher prevalence of T. minos butterflies were observed and recorded over the study. This study highlights the abundance of T. minos in certain months of the study period and peak abundance during the post monsoon period.
{"title":"Population dynamics of southern birdwing (Troides minos Cramer, 1779) in Sirumalai Reserve Forest, Tamil Nadu, India","authors":"B. Archana, E. Joy Sharmila, K. Rangesh, V. Pandi, S. Susaritha, S. Kalai Selvi","doi":"10.33307/entomon.v48i3.947","DOIUrl":"https://doi.org/10.33307/entomon.v48i3.947","url":null,"abstract":"Southern birdwing Troides minos (Cramer, [1779]), a large swallow tail butterfly, state butterfly of Karnataka, is endemic to south India. T. minos was listed in CITES (Convention on International Trade in Endangered species of wild fauna and flora) and is of high conservation priority. IUCN also recommends close monitoring of T. minos. The population trend of T. minos, in Sirumalai Reserve Forest, Eastern Ghats was monitored for the period of twenty six months using the line transect method. Higher prevalence of T. minos butterflies were observed and recorded over the study. This study highlights the abundance of T. minos in certain months of the study period and peak abundance during the post monsoon period.","PeriodicalId":87603,"journal":{"name":"Entomon; internationale Zeitschrift fur die gesamte Insektenkunde","volume":"130 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135038387","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-30DOI: 10.33307/entomon.v48i3.934
Arati Pannure, K. L. Manjunatha, Vidya Mulimani, Vasuki V. Belavadi
A rare species of masked bee Hylaeus strenuus (Cameron, 1897) is reported for the first time from south India. Diagnosis of the species together with the illustrations of morphological characters is presented. Images of the trap nest and nest parameters are provided. A revised checklist of all the known species of the genus Hylaeus from south India along with species distribution map is also provided.
{"title":"First record of a rare masked bee Hylaeus (Indialaeus) strenuus (Cameron, 1897) from south India with an updated checklist of Hylaeus species (Hymenoptera, Colletidae)","authors":"Arati Pannure, K. L. Manjunatha, Vidya Mulimani, Vasuki V. Belavadi","doi":"10.33307/entomon.v48i3.934","DOIUrl":"https://doi.org/10.33307/entomon.v48i3.934","url":null,"abstract":"A rare species of masked bee Hylaeus strenuus (Cameron, 1897) is reported for the first time from south India. Diagnosis of the species together with the illustrations of morphological characters is presented. Images of the trap nest and nest parameters are provided. A revised checklist of all the known species of the genus Hylaeus from south India along with species distribution map is also provided.","PeriodicalId":87603,"journal":{"name":"Entomon; internationale Zeitschrift fur die gesamte Insektenkunde","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135039338","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-30DOI: 10.33307/entomon.v48i3.939
Chimasha Induni, B.A.N Mendis, H.S.D. Fernando, B.G.D.N.K De Silva
Sri Lanka is one of the most affected countries in South Asia by dengue fever, with the number of dengue cases increasing over the last five years. The main strategy for managing disease outbreaks is to reduce infected vector populations with pyrethroid insecticides. However, extensive pyrethroid exposure has resulted in an increase in the selection of knockdown resistance mutations in Aedes aegypti (Linnaeus) (Diptera, Culicidae) voltage-gated sodium channel (vgsc) gene that confer pyrethroid resistance. Colombo district records the highest dengue incidence across the country each year, thus a failed vector control program will be a major threat to public health. Multiplexed Allele-specific PCR was used to genotype kdr alleles in wild Ae. aegypti mosquitoes obtained via random sampling from Wellawatte, Borella, and Battaramulla areas in the Colombo district. This study presents the co-occurrence of F1534C and V1016G kdr mutations from a randomized population in the Colombo district. 1534C mutant allele was predominant (with a 56.7% frequency) and 1016G was prevalent in 32.5 per cent of the population. The heterozygous mutant 1016VG genotype showed the highest distribution (with a 65% frequency) and the incidence of 1534FC was 56.7 per cent. Interestingly, 1016GG was completely absent and the FC/VG mutation combination had the highest incidence with 46.7 per cent. Furthermore, 82.36 per cent of individuals with the 1534FC genotype also had the 1016VG genotype, indicating a high prevalence of pyrethroid resistance in the studied population.
{"title":"Randomized detection of kdr allele frequencies in wild populations of Aedes aegypti (Diptera, Culicidae) in Colombo District, Sri Lanka","authors":"Chimasha Induni, B.A.N Mendis, H.S.D. Fernando, B.G.D.N.K De Silva","doi":"10.33307/entomon.v48i3.939","DOIUrl":"https://doi.org/10.33307/entomon.v48i3.939","url":null,"abstract":"Sri Lanka is one of the most affected countries in South Asia by dengue fever, with the number of dengue cases increasing over the last five years. The main strategy for managing disease outbreaks is to reduce infected vector populations with pyrethroid insecticides. However, extensive pyrethroid exposure has resulted in an increase in the selection of knockdown resistance mutations in Aedes aegypti (Linnaeus) (Diptera, Culicidae) voltage-gated sodium channel (vgsc) gene that confer pyrethroid resistance. Colombo district records the highest dengue incidence across the country each year, thus a failed vector control program will be a major threat to public health. Multiplexed Allele-specific PCR was used to genotype kdr alleles in wild Ae. aegypti mosquitoes obtained via random sampling from Wellawatte, Borella, and Battaramulla areas in the Colombo district. This study presents the co-occurrence of F1534C and V1016G kdr mutations from a randomized population in the Colombo district. 1534C mutant allele was predominant (with a 56.7% frequency) and 1016G was prevalent in 32.5 per cent of the population. The heterozygous mutant 1016VG genotype showed the highest distribution (with a 65% frequency) and the incidence of 1534FC was 56.7 per cent. Interestingly, 1016GG was completely absent and the FC/VG mutation combination had the highest incidence with 46.7 per cent. Furthermore, 82.36 per cent of individuals with the 1534FC genotype also had the 1016VG genotype, indicating a high prevalence of pyrethroid resistance in the studied population.","PeriodicalId":87603,"journal":{"name":"Entomon; internationale Zeitschrift fur die gesamte Insektenkunde","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135038371","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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