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Borah, B. K.
- Population Fluctuations of Plassey Borer, Chilo tumidicostalis Hampson and its Parasitoid, Cotesia flavipes Cameron in Sugarcane Crop in Assam
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PDF Views:130
Authors
Affiliations
1 Regional Agricultural Research Station, Assam Agricultural University, Shillongani, Nagaon 782002, Assam, IN
1 Regional Agricultural Research Station, Assam Agricultural University, Shillongani, Nagaon 782002, Assam, IN
Source
Journal of Biological Control, Vol 23, No 4 (2009), Pagination: 467-470Abstract
Seasonal incidence of Plassey borer, Chilo tumidicostalis Hampson, and its larval parasitoid, Cotesia flavipes Cameron, was studied at Shillogani, Nagaon, Assam, during 2006-07. Population of C. tumidicostalis first appeared in the early part of May and peaked in the second fortnight of September in both the cropping seasons. Later it showed a declining trend till harvest. The activity of C. flavipes commenced from the first fortnight of June in both the cropping seasons and continued till the end of November, 2006 and early part of December, 2007. The extent of natural parasitism by C. flavipes varied from 2.10 to 39.43 per cent in 2006 and 1.33 to 48.30 per cent in 2007. Maximum parasitism (39.43 and 48.30 per cent) occurred during the first fortnight of October, 2006 and the second fortnight of September, 2007 in the two study years. The parasitism increased with the increase in incidence of C. tumidicostalis larvae and fairly synchronized with the latter's maximum incidence. The extent of parasitism had significant positive correlations with the incidence of host larval population and relative humidity, but showed non-significant correlations with temperature, total rainfall and sunshine in both the cropping seasons.Keywords
Chilo tumidicostalis, Cotesia flavipes, Parasitism, Plassey Borer, Sugarcane.Full Text
References
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- Interaction between Aphis craccivora Koch and its Predators, Coccinella transversalis Fabricius (Coleoptera:Coccinellidae) and Ischiodon scutellaris (Fabricius) (Diptera:Syrphidae)
Abstract Views :212 |
PDF Views:135
Authors
Affiliations
1 Department of Entomology, Assam Agricultural University, Jorhat 785 013, Assam, IN
1 Department of Entomology, Assam Agricultural University, Jorhat 785 013, Assam, IN
Source
Journal of Biological Control, Vol 10, No 1&2 (1996), Pagination: 125-128Abstract
The interaction of Coccinella transversalis Fabricius and lschiodon scutellaris (Fabricius) with the aphid, Aphis craccivora Koch was studied on green gram by estimating the prey and predator populations at weekly interval. Populations of both the predators had positive correlation with the aphid, attaining population peak simultaneously with their prey. The population decline of the prey was followed by their predators.
Keywords
Aphis craccivora, Coccinella transversalis, Ischiodon scutellaris, Interaction.Full Text