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Manjunath, D.
- Effect of Temperature on the Developmental Period, Progeny Production and Longevity of Tetrasticbus howardi (Olliff) (Hymenoptera: Eulophidae)
Abstract Views :239 |
PDF Views:133
Authors
Affiliations
1 Pest Management Laboratory Central Sericultural Research & Training Institute, Mysore - 570 008, IN
1 Pest Management Laboratory Central Sericultural Research & Training Institute, Mysore - 570 008, IN
Source
Journal of Biological Control, Vol 8, No 1 (1994), Pagination: 10-13Abstract
The developmental period of Tetrastichus howardi (Olliff), a parasitoid of the uzi fly, EXoista bombyeis (Louis) showed a negative correlation with temperature. It decreased from 51.70 ± 0.64 days at 15°C to 12.83 ± 0.10 days at 30°C. Progeny production had a positive correlation with temperature upto 25°C. The upper and lower temperature threshold limits of T. howardi were 30°C and 15°C respectively. At 35°C and 20°C temperatures, the females survived for 4.20 ± 0.27 days and 19.80 ± 1.09 days without food, while the males lived for 3.10 ± 0.41 days and 11.70 ± 0.44 days respectively. At similar temperatures, life span for fed females were 9.20 ± 0.83 days and 30.90 ± 0.74 days and those for fed males 4.40 ± 0.41 days and 25.0 ± 0.70 days respectively.Keywords
Tetrastichus howardi , Parasitoid, Exorista bombycis , Temperature, Biology.Full Text
- Reproductive Performance of Trichomalopsis uziae as Influenced by Density of its Female and Host (Exorista bombycis) with a Note on Host Exposure Duration for Parasitism
Abstract Views :317 |
PDF Views:147
Authors
Affiliations
1 Central Sericultural Research and Training Institute, Central Silk Board, Govt. of India, Mysuru - 570008, Karnataka, IN
2 Department of Studies in Sericulture Science, University of Mysore, Mysuru - 570006, Karnataka, IN
1 Central Sericultural Research and Training Institute, Central Silk Board, Govt. of India, Mysuru - 570008, Karnataka, IN
2 Department of Studies in Sericulture Science, University of Mysore, Mysuru - 570006, Karnataka, IN
Source
Journal of Biological Control, Vol 33, No 2 (2019), Pagination: 109-116Abstract
Trichomalopsis uziae Sureshan and Narendra Kumar (Hymenoptera: Pteromalidae) is a new addition to the already reported parasitoid complex of the tachinid uzi fly, Exorista bombycis (Diptera: Tachinidae), which causes 10-20% reduction to the silkworm (Bombyx mori L.) cocoon production in the states of Karnataka, Andhra Pradesh, and Tamil Nadu. Due to the non-availability of information on its biological characteristics, an attempt has been made in the present investigation to document the parasitism impact of T. uziae female at various densities of its host and reproductive performance of parasitoid at ratios of 1 to 5:5 (Parasitoid: Host) and 1:1 to 50 (P: H). The reproductive performance of the parasitoid was also assessed based on the durations of host exposure for 1 to10 days at a constant P:H ratio of 1:5. The results revealed that there was no perceptible change in the rate of parasitism at different parasitoid densities. However, the progeny production per female was significantly higher (P < 0.01) at a P:H ratio of 1:5 in comparison with 2:5 to 5:5. Further, at a variable host density (from 1 to 50), there was a linear decrease in per cent parasitism with an increase in host density and it was more drastic from a host density in exceed from 15. However, both progeny production and sex ratio increased with an increase in host density, more so from a host density upwards of 15. The host exposure duration and parasitism rate were significantly inferior at 1day exposure, while it was considerably high at other exposure periods. The progeny production was significantly higher at 2 to 5 days of exposure period without much difference in the sex-ratio.
Keywords
Density, Exposure Duration, Parasitoid, Sex Ratio, Trichomalopsis uziae.Full Text
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