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Girish, K. S.
- Integration of Heterorhabditis indica with other Biorationals for Managing Chickpea Pod Borer, Helicoverpa armigera (Hub.)
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PDF Views:106
Authors
Affiliations
1 Department of Entomology, College of Agriculture, Raichur, 584101, Karnataka, IN
1 Department of Entomology, College of Agriculture, Raichur, 584101, Karnataka, IN
Source
Journal of Biological Control, Vol 22, No 2 (2008), Pagination: 433-448Abstract
A successful management strategy was developed against chickpea pod borer, Helecoverpa armigera (Hub) by integrating locally isolated entomopathogenic nematode, Heterorhabditis indica (RCR) with other entomopathogens like Helicoverpa armigera nuclear polyhedrosis virus (HaNPV) and Bacillus thuringiensis (Bt) and botanicals. Preliminary laboratory studies were conducted, to standardize the optimum dosage of nematodes required for field application, to evaluate the compatibility of nematode with entomopathogens and botanicals and their combinations. The optimum dosage of infective juveniles was standardized to third (LC50 of 145 IJs/larva) and fourth (LC50 of 195 IJs/larva) instars based on the concentration mortality response. Persistence study on chickpea foliage in field condition indicated that, infective juveniles along with 0.1 % glycerol survived better (80%) compared to other anti-dcssicants. In compatibility studies, though H. indica was compatible with other entomopathogens, but was susceptible to higher concentrations of aqueous leaf extracts of some selective botanicals. A series of laboratory bioassay was carried out to select best combinations of H. indica with other entomopathogens and botanicals against third and fourth instar H. armigera and these were tested in field for two consecutive years. Two year field evaluation indicated that, sequential application of H. indica + Prosopis juliflora (1 lakh IJs/I + 10%) at 50 and 75 days after sowing was superior with highest larval reduction (23.47%), minimum pod damage (11.27%) and maximum seed yield (19.24 q/h).Keywords
Heterorhabditis indica, Helicoverpa armigera, Management, Chickpea, Botanicals, HaNPV, Entomopathogens, Mortality.- Field Evaluation of an Insect Parasitic Nematode, Heterorhabditis indica (RCR) in Combination with other Entomopathogens and Botanicals against Chickpea Podborer, Helicoverpa armigera (Hubner)
Abstract Views :201 |
PDF Views:131
Authors
Affiliations
1 Department of Entomology, College of Agriculture, Raichur, 584 101, Karnataka, IN
1 Department of Entomology, College of Agriculture, Raichur, 584 101, Karnataka, IN
Source
Journal of Biological Control, Vol 19, No 1 (2005), Pagination: 59-64Abstract
A field experiment was conducted at Agricultural College, Raichur, Karnataka to evaluate the effect of Heterorhabditis indica (RCR), an insect parasitic nematode in combination with other entomopathogens and botanicals against Helicoverpa armigera (Hübner) in chickpea ecosystem. Pooled data on per cent larval reduction after two sprays revealed that the highest reduction of 47.63 was achieved in chlorpyriphos/quinalphos (0.04/0.05%) treatment at seven days after spraying. However, sequential application of H. indica + Pa. pinnata (1.0 lakh IJs +2.5%) and H. indica + Pr. juliflora (1.0 lakh Us +10%) recorded maximum yield (1.96 and 1.83 kg/plot, respectively) with minimum pod damage (10.9 and 11.5 %, respectively). Thus there is a scope for integration of H. indica with botanicals viz. Pa. pinnata and Pr. juliflora for the effective management of chickpea pod borer.Keywords
Bacillus thuringiensis, Heterorhabditis indica, Larval Reduction, Pongamia pinnata, Prosopis juliflora, Seed Yield.- Bio-Efficacy of Heterorhahditis indica Poinar in Combination with Helicoverpa armigera Polyhedrosis Virus against Helicoverpa arnligera (Hubner)
Abstract Views :214 |
PDF Views:109
Authors
Affiliations
1 Department of Entomology, College of Agriculture, University of Agricultural Sciences, Raichur 584 101, Karnataka, IN
1 Department of Entomology, College of Agriculture, University of Agricultural Sciences, Raichur 584 101, Karnataka, IN