Bioefficacy of beauveria bassina (Balsamo) vuillemin against hyadaphis coriandri (Das) on coriander and aphis craccivora (Koch) on fenugreek

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dc.contributor.advisorKaushik, H.D.
dc.contributor.authorK. Selvaraj
dc.date.accessioned2016-11-18T13:50:10Z
dc.date.available2016-11-18T13:50:10Z
dc.date.issued2008
dc.description.abstractInvestigations were carried out to assess the pathogenicity of Beauveria bassiana against Hyadaphis coriandri and Aphis craccivora on coriander and fenugreek plant, respectively. Bioassay studies under laboratory and green house conditions were carried out to determine the LC50 and LT50 values of B. bassiana against these insects. Field studies were also carried out to assess the bioefficacy of B. bassiana against H. coriandri and A. craccivora. The results obtained from the studies on the pathogenicity of fungal pathogen revealed that B. bassiana were 143 found effective against H. coriandri and A. craccivora. The cumulative corrected mortality (CCM) of H. coriandri ranged from 30.91 – 49.52 per cent one day after treatment. It was 67.61 – 96.85 per cent 7 DAT under laboratory conditions. Whereas, for A. craccivora, the cumulative corrected mortality ranged from 24.0-48.26 per cent at 1 DAT and it was 58.56-94.98 per cent at 7 DAT. In greenhouse studies, the cumulative corrected mortality ranged from 22.81-45.52 per cent at 1 DAT, it was 58.41-90.93 per cent at 7 DAT. Whereas, for A. craccivora it ranged from 20.85-43.50 per cent at 1 DAT, and it was 55.21-85.04 per cent at 7 DAT. In laboratory investigations, the LC50 value of B. bassiana against H. coriandri and A. craccivora were 1.5x104 and 0.94 x 106 spores/ml, respectively. LT50 values of B. bassiana against H. coriandri was ranged from 45.70 – 141.57 hours. However, 50 per cent mortality achieved in 45.70 hours at 1x1010 spores/ml. While it was ranged from 46.89-144.07 hours, for A. craccivora, the 50 per cent mortality achieved in 46.83 hours at 1x1010 spores/ml. While in greenhouse studies, the LC50 value of B. bassiana against H. coriandri and A. craccivora were 1.7x106 and 1.2x108 spores/ml, respectively. The LT50 value of B. bassiana against H. coriandri was ranged from 69.15-147.82 hours, however, 50 per cent mortality achieved in 69.15 hours at 1x1010 spores/ml. While it was ranged from 73.24-157.39 hours for A. craccivora. The 50 per cent mortality achieved in 73.24 hours at 1x1010 spores/ml.B. bassiana was found effective against H. coriandri under field conditions which showed significant reduction in the aphid population. Population reduction of H. coriandri to an extent of 81.87 per cent at 1x1011 spores/ml after 7 days of treatment was observed. The commercial formulation (Daman) showed higher per cent reduction (83.41%). However, standard check malathion 50 EC showed highest reduction of 92.81 per cent. B. bassiana was also found effective against A. craccivora under field conditions showing significant reduction in the aphid population. Population reduction of A. craccivora to an extent of 79.11 per cent at 1x1011 spores/ml after 7 days of treatment was recorded. The commercial formulation (Daman) showed higher per cent reduction (81.34%). However, standard check malathion 50 EC showed highest reduction 90.0 per cent.en_US
dc.identifier.urihttp://krishikosh.egranth.ac.in/handle/1/86301
dc.language.isoenen_US
dc.publisherCCSHAUen_US
dc.subEntomology
dc.subjectBeauveria bassiana, Hyadaphis coriandri, Aphis craccivora, Pathogenicity, LC50 and LT50 valuesen_US
dc.these.typeM.Sc
dc.titleBioefficacy of beauveria bassina (Balsamo) vuillemin against hyadaphis coriandri (Das) on coriander and aphis craccivora (Koch) on fenugreeken_US
dc.typeThesisen_US
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