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Kannan, M.
- Isolation and Characterization of Indigenous Nucleopolyhedrovirus Infecting Fall Armyworm, Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae) in India
Abstract Views :233 |
PDF Views:80
Authors
G. Sivakumar
1,
M. Kannan
2,
S. Ramesh Babu
3,
M. Mohan
1,
M. Sampath Kumar
1,
P. Raveendran
1,
T. Venkatesan
1,
R. Rangeshwaran
1,
Chandish R. Ballal
1,
P. Ram Kumar
1
Affiliations
1 ICAR-National Bureau of Agricultural Insect Resources, Hebbal, Bengaluru 560 024, IN
2 Department of Plant Protection, Horticultural College and Research Institute, Periyakulam, Tamil Nadu Agricultural University, Coimbatore 641 003, IN
3 Agricultural Research Station, Borwat Farm, MPUAT, Banswara 327 001, IN
1 ICAR-National Bureau of Agricultural Insect Resources, Hebbal, Bengaluru 560 024, IN
2 Department of Plant Protection, Horticultural College and Research Institute, Periyakulam, Tamil Nadu Agricultural University, Coimbatore 641 003, IN
3 Agricultural Research Station, Borwat Farm, MPUAT, Banswara 327 001, IN
Source
Current Science, Vol 119, No 5 (2020), Pagination: 860-864Abstract
Fall armyworm (FAW), Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae) is an invasive insect pest of maize in India. Natural occurrence of nucleopolyhedrovirus (NPV) infection on S. frugiperda larvae was recorded in 2018 during surveys conducted in maize fields in Chikkaballapura district of Karnataka, and Coimbatore and Tirupattur districts of Tamil Nadu. A strain of S. frugiperda nucleopolyhedrovirus (SpfrNPV NBAIR1) infecting S. frugiperda was isolated from the diseased larvae; morphological and biological characteristics were studied. Electron microscopic studies showed tetrahedral-shaped SpfrNPV occlusion bodies (OBs) of size 1.64 μm. Dose–mortality bioassays revealed that first, second and third instar larvae were equally susceptible (LC50 3.71–5.02 OBs/mm2) to SpfrNPV infection. A PCR technique for detection of viral DNA in S. frugiperda NPV was developed by employing the polyhedrin gene (polh)-specific primers. The amplicon of 618 bp was amplified, sequenced and NCBI GenBank accession number was obtained (MT422725). Blast analysis revealed that SpfrNPV conserved polh gene sequence matched 100% with the reference GenBank sequence (J04333) from the NCBI database which confirmed the identity of the SpfrNPV.Keywords
Insect Pests, Maize, Nucleopolyhedrovirus, Spodoptera frugiperda.Full Text
- Natural Occurrence of Entomopathogens on the Invasive Fall Armyworm, Spodoptera Frugiperda (j.e. Smith) in South India
Abstract Views :240 |
PDF Views:79
Authors
G. Sivakumar
1,
M. Mohan
1,
M. Kannan
2,
K. Elango
3,
P. Ram Kumar
1,
T. Venkatesan
1,
R. Rangeshwaran
1,
Mahesh S. Yandigeri
1,
O. Dhanyakumar
1
Affiliations
1 ICAR-National Bureau of Agricultural Insect Resources, Hebbal, Bengaluru 560 024, IN
2 Department of Nanoscience and Technology, Periyakulam, Tamil Nadu Agricultural University, Coimbatore 641 003, IN
3 Horticultural Research Station, Tamil Nadu Agricultural University, Kodaikanal 624 103, IN
1 ICAR-National Bureau of Agricultural Insect Resources, Hebbal, Bengaluru 560 024, IN
2 Department of Nanoscience and Technology, Periyakulam, Tamil Nadu Agricultural University, Coimbatore 641 003, IN
3 Horticultural Research Station, Tamil Nadu Agricultural University, Kodaikanal 624 103, IN
Source
Current Science, Vol 120, No 4 (2021), Pagination: 619-621Abstract
No Abstract.Full Text
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- Characterization of granulosis viruses of sugarcane early shoot borer, Chilo infuscatellus (Snell.) and internode borer, Chilo sacchariphagus indicus (Kapur)
Abstract Views :185 |
PDF Views:78
Authors
Affiliations
1 Nano Science and Technology, Tamil Nadu Agricultural University, Coimbatore 641 003, IN
2 ICAR-Sugarcane Breeding Institute, Coimbatore 641 007, IN
3 Imayam Institute of Agriculture and Technology, Tiruchirappalli 621 206, IN
4 ICAR-National Bureau of Agricultural Insect Resources, Hebbal, Bengaluru 560 024, IN
1 Nano Science and Technology, Tamil Nadu Agricultural University, Coimbatore 641 003, IN
2 ICAR-Sugarcane Breeding Institute, Coimbatore 641 007, IN
3 Imayam Institute of Agriculture and Technology, Tiruchirappalli 621 206, IN
4 ICAR-National Bureau of Agricultural Insect Resources, Hebbal, Bengaluru 560 024, IN
Source
Current Science, Vol 121, No 4 (2021), Pagination: 570-573Abstract
A study was undertaken to characterize the granulosis viruses (GVs) of early shoot borer, Chilo infuscatellus (Snell.) (Crambidae: Lepidoptera) and internode borer, Chilo sacchariphagus indicus (Kapur) (Lepidoptera: Crambidae) in sugarcane. Scanning electron photomicrographs revealed ovo-cylindrical occlusion bodies (OBs) of GVs in early shoot and internode borers with an average size of 425.03 and 230.21 nm, 387.64 and 208.68 nm in length and breadth respectively. Transmission electron photomicrographs also showed ovo-cylindrical OBs embedded with a rod-shaped virion. The average length and breadth of the virion in the OB was 271.0 ´ 52.6 nm, 257.0 ´ 50.2 nm for early shoot and internode borer GVs respectively. Toxicity studies with the respective GVs revealed lethal concentration values of 4.38, 4.61, 6.89 OBs/mm2 and 1.85, 135.43, 8045.27 OBs/mm2 to second, third and fourth larval instars of Chilo infuscatellus granulosis virus (ChinGV) and Chilo sacchariphagus indicus granulosis virus (ChsaGV) respectively.Keywords
Early shoot borer, granulosis viruses, internode borer, occlusion bodies, sugarcane, toxicity.Full Text
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- Sivakumar, G. et al., Isolation and characterization of indigenous nucleopolyhedrovirus infecting new invasive Fall armyworm Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae) in India. Curr. Sci., 2020, 119, 860–864.
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- Gut bacteria mediated insecticide resistance in cotton leafhopper Amrasca biguttula biguttula
Abstract Views :199 |
PDF Views:85
Authors
G. Sivakumar
1,
M. Mohan
1,
K. Subaharan
1,
T. Venkatesan
1,
Sanjay Yelshetti
1,
M. Kannan
2,
R. Anandham
3,
M. S. Yandigeri
1,
Surabhi Kumari
1,
K. Elango
4,
P. Ram Kumar
1
Affiliations
1 ICAR-National Bureau of Agricultural Insect Resources, Bengaluru 560 024, IN
2 Department of Nanoscience and Technology, Tamil Nadu Agricultural University, Coimbatore 641 003, IN
3 Department of Agricultural Microbiology, Tamil Nadu Agricultural University, Coimbatore 641 003, IN
4 Department of Agricultural Entomology, Kumaraguru Institute of Agriculture, Erode 638 315, IN
1 ICAR-National Bureau of Agricultural Insect Resources, Bengaluru 560 024, IN
2 Department of Nanoscience and Technology, Tamil Nadu Agricultural University, Coimbatore 641 003, IN
3 Department of Agricultural Microbiology, Tamil Nadu Agricultural University, Coimbatore 641 003, IN
4 Department of Agricultural Entomology, Kumaraguru Institute of Agriculture, Erode 638 315, IN
Source
Current Science, Vol 122, No 8 (2022), Pagination: 958-964Abstract
Cotton leafhopper, Amrasca biguttula biguttula (Ishida) (Hemiptera: Cicadellidae) is a major sucking insect pest of cotton in India. Indiscriminate use of pesticides has led to the development of resistance to most of the recommended pesticide groups. Though there are multiple mechanisms and principles of insecticide resistance development in insects, the gut bacterial-mediated degradation of insecticides is relatively less explored. In the present study, the gut bacteria of field-collected, insecticide-resistant population of A. biguttula biguttula were compared with a laboratory-reared susceptible population. Among the five culturable gut bacteria from the imidacloprid-resistant population, only Enterococcus silesiacus CLHG1a exhibited growth in the agar medium amended with 50 and 100 ppm of imidacloprid. The imidacloprid degrading capacity of E. silesiacus CLHG1a was further confirmed by HPLC analysis. E. silesiacus and Bacillus amyloliquefaciens CLHG2 showed higher esterolytic activity (0.348 and 0.309 mmoles/min/mg respectively). The esterase zymogram on native PAGE revealed a single major band. This study provides clear evidence that the bacterium E. silesiacus isolated from the gut of A. biguttula biguttula has the ability to degrade imidacloprid and may have played a role in the detoxification of pesticides.Keywords
Cotton, detoxification, esterase activity, gut microflora, insecticide resistance, leafhopper.Full Text
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