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Saranya, S.
- Natural Epizootics of Cladosporium cladosporioides on Tetranychus urticae Koch. (Acari.: Tetranychidae) in Coimbatore
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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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- 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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- Shi, WB and Feng MG 2004b. Lethal effect of Beauveria bassiana, Metarhizium anisopliae, and Paecilomyces fumosoroseus on the eggs of Tetranychus cinnabarinus (Acari: Tetranychidae) with a description of a mite egg bioassay system. Biol. Control, 30: 165–173.
- Srinivasa, N and Sugeetha J. 1999. Bio effectiveness of certain botanicals and synthetic pesticides against okra spider mite Tetranychus macfarlanei. J. Acarol., 15: 1-5.