Monitoring and laboratory evaluation of native isolates of
entomogenous fungi against chickpea pod borer (Helicoverpa
armigera Hubner).
Rijal, J. P., Y. D. GC, R. B. Thapa and S. M. Shrestha. 2007.
IAAS Research Advances Vol. 2. Institute of Agriculture and Animal Sciences, Rampur, Chitwan, Nepal.
pp. 89-94.
Keywords: Chick pea pod borer,
Metarhizium anisopliae,
Beauveria bassiana, LT50
Monitoring with pheromone trap was carried out at farmer’s field in two
locations (Rampur
and Fulbari) of Mangalpur VDC, Chitwan to monitor the occurrence of
Helicoverpa armigera Hubner during the winter season of 2004/05. During the
second week of March, peak catches of 91 male moths were recorded at Rampur, while it was the maximum (42 male
moths) during the third week of March at Fulbari. Other experiment was conducted
at Insect Pathology Unit, Department of Entomology,
Institute
of Agriculture and Animal Sciences, Rampur during 2005 to test
the comparative efficacies of native isolates of two entomogenous fungi,
Metarhizium anisopliae (Metsch.)
Sorokin and Beauveria bassiana (Bals.)
Vuill against the third instar larvae of H. armigera. Each experimental
unit included 25 larvae, which were observed for 21 days for mortality
assessment. Out of four isolates (M1, M48, M65, M70) of
M. anisopliae, M1 caused maximum
mortality (94.67%), infection (45.33%) within 7.49 days (LT50). Similarly,
maximum mortality (98.67%), infection (80.00%) with the least LT50 value (5
days) was resulted by B3 isolate (between B1 and B3) of
B. bassiana. Mycosis was observed at
7.22 days after the death of larvae in B3 followed by B1 (7.36 days) and M70
(7.39 days), respectively.
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