Bioefficacy of beauveria bassina (Balsamo) vuillemin against hyadaphis coriandri (Das) on coriander and aphis craccivora (Koch) on fenugreek
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Date
2008
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CCSHAU
Abstract
Investigations 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
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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.
Description
Keywords
Beauveria bassiana, Hyadaphis coriandri, Aphis craccivora, Pathogenicity, LC50 and LT50 values