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Murali Krishna, T.
- Evaluation of Oil Formulations of Nomuraea rileyi (Farlow) Samson against Spodoptera litura under Laboratory Conditions
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Authors
Affiliations
1 Department of Entomology, S.V. Agricultural College (A.N.G.R.A.U.), Tirupati (A.P.), IN
1 Department of Entomology, S.V. Agricultural College (A.N.G.R.A.U.), Tirupati (A.P.), IN
Source
International Journal of Plant Sciences, Vol 10, No 1 (2015), Pagination: 29-32Abstract
Three oil formulations of entomopathogenic fungus Nomuraea rileyi were evaluated for their efficacy along with crude formulation against third instar Spodoptera litura during 2011-2012 at the Department of Entomology, S.V. Agricultural College, Tirupati. Mean larval mortalities of 96.67, 93.33, 86.67 and 76.67 per cent, respectively were recorded with groundnut, sunflower, coconut oil based formulations and crude formulation of N. rileyi at highest concentration i.e., 1 x 108 spores ml-1 at 10 DAT. More than 70 per cent larval mortalities of S. litura were obtained with the concentrations above 1 x 106 spores per ml in case of groundnut oil and sunflower oil based formulations. The mortalities gradually reduced with concentration showing the least at 1 x 102 spores ml-1. Incubation period, was in negative correlation with the concentration of N. rileyi in all the formulations. Pupal mortalities and malformed adults emergence showed positive association with concentration of N. rileyi against S. litura larvae.Keywords
N. rileyi, Oil Formulation, Lab Evaluation, S. litura.
References
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- Vimaladevi, P.S., Prasad, Y.G. and Chowdary, A. (2002). Effect of drying and formulation of conidia on virulence of the entomofungal pathogen Nomuraea rileyi (Farlow) Samson. J. Biol. Control, 16(1): 43-48.
- Testing the Pathogenecity of Nomuraea rileyi (Farlow) Samson against Castor Semilooper, Achaea janata Linnaeus
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Authors
Affiliations
1 Department of Entomology, S.V. Agricultural College, Tirupati 517 502, IN
1 Department of Entomology, S.V. Agricultural College, Tirupati 517 502, IN
Source
Journal of Biological Control, Vol 27, No 4 (2013), Pagination: 349–353Abstract
The larvae of II, III and IV instars of Achaea janata treated with subculture I, II and insect cultures of Nomuraea rileyi indicated larval mortalities to be positively correlated with the concentrations of all the three cultures. First subculture and insect culture were almost equally efficacious in causing the disease. Slightly lowered mortality were recorded with subculture II. Reduction in larval mortality was noticed with advancement of the age in A. janata larvae. Almost 100 per cent larvae were dead with 1x108 spores ml-1 concentration when treated in II intar and it was 5-15 per cent when treated in III and IV instars. However, relatively lower concentrations like 1x104 - and 1x105 spores ml-1 also recorded mortality of 50 per cent and above. The lowest concentration of 1x102 spores ml-1 resulted in 20-30 per cent larval mortality.Keywords
Nomuraea rileyi, Subculture, Insect Cultures, Achaea janata, Pathogenicity, Larval Mortality.Full Text
References
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- Bio-Efficacy of Certain Botanicals and Bio-Pesticides against Tobacco Caterpillar, Spodoptera litura Fab. in Rabi Groundnut
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Authors
Affiliations
1 Department of Entomology, S.V. Agricultural College, ANGRAU, Tirupati-517502 Andhra Pradesh, IN
1 Department of Entomology, S.V. Agricultural College, ANGRAU, Tirupati-517502 Andhra Pradesh, IN
Source
Journal of Biological Control, Vol 29, No 3 (2015), Pagination: 131-133Abstract
Field trial was conducted in dry land Farm of S.V. Agricultural College, Tirupati during two consecutive rabi seasons of 2012-13 and 2013-14, to evaluate the efficacy of botanical and microbial insecticides against tobacco caterpillar, Spodoptera litura infesting groundnut on cultivar Kadiri-6. Among the treatments tested NPV (S. litura) @ 250 LE ha-1 and Bacillus thuringiensis (Bt) sprays were significantly effective in reducing larval population, leaf damage and resulted in significant increase in haulm yields and cost benefit ratio. This was followed by Nomuraea rileyi 1.5x1013 spores mL-1 and NSKE @ 5.0 percent compared to other treatments neem oil @ 2.0 mlL-1 and Beauveria bassiana 1.5x1013 spores mL-1 respectively.Keywords
Botanicals, Bio-Pesticides, Spodoptera litura.Full Text