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Kumar, Parminder
- Effect of Low Temperature Storage on the Efficiency of Three Species of Trichogrammatids
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PDF Views:115
Authors
Affiliations
1 Department of Entomology, Punjab Agricultural University, Ludhiana, 141 004, Punjab, IN
1 Department of Entomology, Punjab Agricultural University, Ludhiana, 141 004, Punjab, IN
Source
Journal of Biological Control, Vol 19, No 1 (2005), Pagination: 17-22Abstract
The effect of low temperature (4 ± 0.5°C) and refrigerator storage on three trichogrammatids, viz Trichogramma chilonis Ishii, T. pretiosum Riley and T. brasiliense Ashmead was studied under laboratory conditions. T. chilonis and T. pretiosum can be stored for 20 days whereas T. brasiliense for 10 days without adversely affecting their emergence and parasitisation efficiency taking 60 per cent emergence and 60 per cent parasitism as standard. The emergence in 71 brasiliense reached zero per cent after 34 days of storage whereas 20.3 per cent was recorded in T. chilonis and 1S.7 per cent in T. pretiosum after 60 days of storage. T. chilonis showed the highest emergence and parasitization efficiency followed by T. pretiosum and T. brasiliense.Keywords
Emergence, Parasitization Efficiency, Storage, Trichogrammatids.Full Text
- Field Evaluation of Trichogrammatids for the Control of Helicoverpa armigera (Hubner) on Tomato
Abstract Views :219 |
PDF Views:123
Authors
Affiliations
1 Department of Entomology, Punjab Agricultural University, Ludhiana, 141 004, Punjab, IN
1 Department of Entomology, Punjab Agricultural University, Ludhiana, 141 004, Punjab, IN
Source
Journal of Biological Control, Vol 18, No 1 (2004), Pagination: 45-50Abstract
Trichogramma chilonis Ishii, T. pretiosum Riley and T. brasiliense Ashmead were field evaluated at three different dosages (50,000, 75,000 and 100,000/ha)" against Helicoverpa armigera (Hiibner) on tomato. No significant difference was observed in mean egg count in all the treatments. However, significant difference was observed in larval population and lowest mean larval population (0.5 larvae/5 plants) was recorded in T. chilonis @ one lakh/ha dosage. Highest parasitism (41.07%) was recorded where releases of T. chiollis were made @ one lakh/ha, and it was on par with the treatment of 75,000/ha of T. chiollis (40.0()%). Lowest fruit damage (8.01 %) was recorded in treatment where T. chilollis was released @ one lakh/ha, which was followed by the release of T. chilonis @ 75,000/ha (9.20%), one lakh/ha of T. brasiliellse (11.66%), and T. pretiosum @ 1,000,000 and 75,000/ha (10.88 and 11.82%, respectively). Highest (261.07q/ha) yield was form treatment of T. chilonis @ one lakh/ha, followed by T. chilonis 75,000/ha (248.27q/ha).Keywords
Dosages, Field evaluation, Helicaverpa armigera, Tomato, Trichogrammatids.Full Text