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Jeyarani, S.
- Natural Epizootics of Cladosporium cladosporioides on Tetranychus urticae Koch. (Acari.: Tetranychidae) in Coimbatore
Abstract Views :272 |
PDF Views:153
Authors
Affiliations
1 Department of Agricultural Entomology, Tamil Nadu Agricultural University, Coimbatore 641 039, Tamil Nadu, IN
1 Department of Agricultural Entomology, Tamil Nadu Agricultural University, Coimbatore 641 039, Tamil Nadu, IN
Source
Journal of Biological Control, Vol 27, No 2 (2013), Pagination: 95-98Abstract
Investigations on the natural epizootics of Cladosporium cladosporioides (Fresenius) de vries were carried out on Okra grown at Tamil Nadu Agricultural University, Coimbatore during 2010 and 2011. Observations on the incidence of mycosed mites were monitored continuously on okra at weekly interval during the study period. Occurrence of mycosis on Tetranychus urticae Koch due to C. cladsoporioides was high during third week of August 2010 (67.58%) followed by first week of August 2011 (47.24%), respectively. Fungal infection on mites had significant positive correlation with relative humidity and negative correlation with sunshine hours during the study period. An epizootic incidence of Cladosporium cladosporioides recorded on T. urticae is the first report from Coimbatore, Tamil Nadu.Keywords
Epizootics, Cladosporium cladosporioides, Tetranychus urticae, Okra, Weather Factors.Full Text
References
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- Jeyarani S, Gulsarbanu J, Ramaraju K. 2011. First record of natural occurrence of Cladosporium cladosporioides (Fresisenius) de veries and Beauveria bassiana (Bals.-Criv.) Vuill on two spotted spider mite, Tetranychus urticae Koch from India. J Entomol. 8(3): 274–279.
- Lacey LA, Frutos R, Kaya HK, Vail P. 2001. Insect pathogens as biological control agents: Do they have a future? Biol Control 21(3): 230–248.
- Ramegowda GK, Patil RK, Lingappa S, Kulkarni S. 2010. Studies on epizootiology and aerobiology of Nomuraea rileyi (Farlow) Samson. Int J Sci Nature 1(2): 226–235.
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- In vivo Enhancement of Nucleopolyhedrovirus Infection in Helicoverpa armigera (Hübner) by the Granulovirus of Spodoptera litura Fabricius
Abstract Views :330 |
PDF Views:143
Authors
Affiliations
1 Department of Agricultural Entomology, Centre for Plant Protection Studies, Tamil Nadu Agricultural University, Coimbatore 641 003, Tamil Nadu, IN
1 Department of Agricultural Entomology, Centre for Plant Protection Studies, Tamil Nadu Agricultural University, Coimbatore 641 003, Tamil Nadu, IN
Source
Journal of Biological Control, Vol 26, No 3 (2012), Pagination: 234–239Abstract
Biopesticides based on baculoviruses offer great scope as promising viral insecticides against Helicoverpa armigera (Hübner). However, an important limitation in the use of baculoviruses is their reduced efficacy against grown up larvae. The infectivity of NPV against grown up larvae were reported to be enhanced by the presence of a viral enhancing factor (VEF) in granuloviruses (GV). Hence, we investigated the possible interaction of GVs of Spodoptera litura (SlGV), Agrotis segetum (AsGV), Plutella xylostella (PxGV), Achaea janata (AjGV) and Chilo infuscatellus (CiGV) separately with the NPV of H. armigera (HearNPV) against second, third, fourth and fifth instar H. armigera. Of the GVs tested with HearNPV, SlGV alone synergized HearNPV action with reduced LC50 values. The integration of SlGV with HearNPV resulted in 9.38, 10.93, 10.70 and 13.32 fold reduction in LC50 values against the second, third, fourth and fifth instars respectively. Tests conducted with heat inactivated (at 75, 80, 85 and 121°C for 10 min) and heat shielded SlGV could give similar effects with HearNPV indicating that the cause for the virulence enhancement rests with the capsular protein and not the virions of the SlGV, since the virions could be inactivated at temperatures more than 70°C. Integration of SlGV and HearNPV was found to shorten the LT50 values.Keywords
Helicoverpa armigera, Granulovirus, Nucleopolyhedrovirus, Enhancing Factor.Full Text
References
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- Efficacy of Predators against the Two Spotted Spider Mite, Tetranychus urticae Koch (acari: Tetranychidae)
Abstract Views :271 |
PDF Views:117
Authors
Affiliations
1 Department of Agricultural Entomology, Centre for Plant Protection Studies, Tamil Nadu Agricultural University, Coimbatore 641 003, Tamil Nadu, IN
1 Department of Agricultural Entomology, Centre for Plant Protection Studies, Tamil Nadu Agricultural University, Coimbatore 641 003, Tamil Nadu, IN
Source
Journal of Biological Control, Vol 26, No 3 (2012), Pagination: 279–282Abstract
Survey conducted for inventorying the natural enemies of Tetranychus urticae Koch revealed the occurrence of predatory insects viz., Stethorus pauperculus (Weise) (0.00 to 8.65 %), Oligota sp. (0.00 to 5.98 %), Scolothrips sp. (0.00 to 5.69 %) and predatory mite, Amblyseius longispinosus (Evans) (0.00 to 6.43 %) in okra growing areas of Coimbatore district. Investigations on the predatory potential of these predators against T. urticae under laboratory conditions showed that the adult female of S. pauperculus consumed significantly more number of 167.14 eggs / 63.71 nymphs / 61.42 adults of T. urticae per day per individual. The grubs of S. pauperculus were as voracious as the adults and the predation increased with the advancement of larval stages. Similarly, adult Scolothrips sp. and A. longispinosus were more efficient than the immatures in devouring the prey. However, in case of Oligota sp., the grub stage recorded the maximum consumption of prey mite by devouring 81.28 eggs / 45.71 nymphs / 15.14 adults of T. urticae per day per individual.Keywords
Tetranychus urticae, Stethorus pauperculus, Oligota Sp., Scolothrips Sp., Amblyseius longispinosus.Full Text
References
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- Safety of Uv-selected Helicoverpa armigera Nucleopolyhedrovirus to Non-target Beneficial Organisms
Abstract Views :225 |
PDF Views:116
Authors
Affiliations
1 Department of Agricultural Entomology, Centre for Plant Protection Studies, Tamil Nadu Agricultural University, Coimbatore - 641003, Tamil Nadu, IN
1 Department of Agricultural Entomology, Centre for Plant Protection Studies, Tamil Nadu Agricultural University, Coimbatore - 641003, Tamil Nadu, IN
Source
Journal of Biological Control, Vol 22, No 1 (2008), Pagination: 107-112Abstract
The safety of the UV-selected Coimbatore isolate of Helicoverpa armigera nucleopolyhedrovirus (HaNPV-UVT-CBEI) was tested against the non-target organisms viz., Trichogramma chilonis, Chrysoperla carnea, honey bee species and Bombyx mori to find out whether the cyclical exposure of HaNPV to ultra-violet (UV) radiation could cause adverse effect on the above organisms. The results showed that the HaNPV-UVT-CBEI had no adverse effect on the growth parameters, survival and production parameters of the organisms tested in comparison with the UV shielded HaNPV (HaNPV-UVS-CBEI). The cyclical exposure of HaNPV to UV radiation for the selection of UV tolerant strain did not have any deleterious effect on the safety of the virus to the non-target organisms.Keywords
Apis sp., Bombyx mori, Chrysoperla carnea, Helicoverpa armigera, Nucleopolyhedrovirus, Safety, Trichogramma chilonis.Full Text
- Evaluation of Oil Based Formulation of Beauveria bassiana (Bb 112) (Bals.) Vuill. and Delivery Methods for the Management of Chilli Thrips, Scirtothrips dorsalis Hood
Abstract Views :247 |
PDF Views:134
Authors
Affiliations
1 Department of Agricultural Entomology, Centre for Plant Protection Studies, Tamil Nadu Agricultural University, Coimbatore - 641003, Tamil Nadu, IN
1 Department of Agricultural Entomology, Centre for Plant Protection Studies, Tamil Nadu Agricultural University, Coimbatore - 641003, Tamil Nadu, IN
Source
Journal of Biological Control, Vol 32, No 1 (2018), Pagination: 62-67Abstract
In recent years, increased interest has been shown towards biological control based management practices following the unsatisfactory results with the application of conventional insecticides. In Integrated Pest Management, selection of right plant protection methods coupled with right appliance is important to tackle the target pest in an effective manner. In this context, microplot and field trials were carried out to evaluate the efficacy of the oil based formulation of B. bassiana (Bb 112) against chilli thrips, Scirtothrips dorsalis Hood to identify an effective delivery method among different sprayers used (ASPEE Maruyama Engine sprayer, Avenger ULV sprayer, ASPEE Battery sprayer, ASPEE Knapsack hand sprayer, ASPEE Hitech hand sprayer and CDA sprayer). Microplot experiment on chilli thrips, S. dorsalis revealed that the oil based formulation of B. bassiana (Bb 112) was significantly superior to all other treatments and recorded the highest cumulative mean population reduction of 47.54 per cent. The cumulative mean per cent reduction in first (at Kumarapalayam) and second field trial (at Ambilikkai) against Chilli thrips showed that, oil based formulation of B. bassiana (Bb 112) @ 108 spores ml-1 sprayed with CDA sprayer was significantly superior to other treatments with 43.01 and 46.65 per cent reduction, respectively.Keywords
Beauveria bassiana, Chilli Thrips, CDA Sprayer, Field, Microplot, Oil Based Formulation.Full Text
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- Relative Safety of Beauveria bassiana (Bb 112) oil formulation to Cryptolaemus montrouzieri Mulsant
Abstract Views :247 |
PDF Views:120
Authors
Affiliations
1 Department of Agricultural Entomology, Centre for Plant Protection Studies, Tamil Nadu Agricultural University, Coimbatore - 641003, Tamil Nadu, IN
1 Department of Agricultural Entomology, Centre for Plant Protection Studies, Tamil Nadu Agricultural University, Coimbatore - 641003, Tamil Nadu, IN
Source
Journal of Biological Control, Vol 32, No 3 (2018), Pagination: 212-214Abstract
Biopesticides are promising alternatives to chemical pesticides, and they have opened up new panorama in insect pest management to aid in the promotion of safe, eco-friendly pest management. They are relatively host specific and do not interfere with other biotic systems. Research concerning the development of biopesticides has focused mainly on identification of virulent isolates of bioagents for effective management of the target pests. However, information pertaining to their effects on natural enemies, non-target pests, and environment is scanty. In the present study, oil formulation of fungal pathogen, Beauveria bassiana (Bb 112) was tested against adults of Cryptolaemus montrouzieri Mulsant (Coleoptera:Coccinellidae), under laboratory condition. Oil formulation of B. bassiana (Bb 112) has been found to be safer to C. montrouzieri adults with maximum adult survival of 92.62 per cent at the highest dose (108 spores ml-1) and 100 per cent survival at lower dose tested (104 spores ml-1) respectively.Keywords
Adult Survival, Biopesticide, Bb 112, Cryptolaemus montrouzieri, Safety.Full Text
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- Ovicidal action of different fungal pathogens against two spotted spider mite, Tetranychus urticae (Koch) under laboratory conditions
Abstract Views :257 |
PDF Views:162
Authors
Affiliations
1 Department of Agricultural Entomology, Tamil Nadu Agricultural University, Coimbatore, Tamil Nadu, IN
1 Department of Agricultural Entomology, Tamil Nadu Agricultural University, Coimbatore, Tamil Nadu, IN
Source
Journal of Biological Control, Vol 35, No 1 (2021), Pagination: 37-40Abstract
Bioassay studies were performed with ten different fungal isolates of six species against two spotted spider mite, Tetranychus urticae. Among different formulations, Hirsutella thompsonii caused significantly higher mortalities of 61.1, 35.8 and 22.1 per cent at conidial concentrations of 971, 196 and 36 conidia mm-2, respectively. At a conidial concentration of 1457 conidia mm-2, Beauveria bassiana isolate Bb101 caused significantly higher mortality rate of 46.9 per cent followed by B. bassiana isolate B2 (36.1%) and Cladosporium cladosporioides isolate Cc101 (32.1%). Based on the probit estimates, H. thompsonii was found to exert high ovicidal activity with the lowest LC50 of 674 conidia mm2 against T. urticae eggs.
Keywords
Entomopathogenic Fungi, Ovicidal Effect, Tetranychus urticaeFull Text
References
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