Studies on syrphid predators of sugarcane woolly aphid (ceratovacuna lanigera zehntner)
KrishiKosh
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Title |
Studies on syrphid predators of sugarcane woolly aphid (ceratovacuna lanigera zehntner)
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Creator |
Likhil E.K.
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Contributor |
C.P.Mallapur
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Subject |
Agricultural Entamology
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Description |
The role played by syrphids in the management of Sugarcane Woolly Aphid were studied under both laboratory and field conditions during 2005-06 at Department of Agricultural Entomology, College of Agriculture, Dharwad and at farmer’s fields. The syrphid species associated with SWA comprised of two species viz., Eupeodes confrater and Dideopsis aegrota and E. confrater was the major species occurring in all the locations (62.58 to 100%). Two groups of natural enemies on syrphids were identified, one larvalpupal parasitioid belonging to family Ichneumonidae (Diplazon laetatorius) and three species of bacterial pathogens viz., Citrobactor sp., Aeromonas sp. and Bacillus sp. The breeding of E. confrater was not possible in caged condition. The predator completed three larval instars with a total larval period of 12.12+0.31 (10-14) days. Pupal period ranged from 7 to 9 days with a mean of 8.30+0.26 days. The longevity of male and female was recorded at 13.27+0.89 (10-20) days and 17.6+1.52 (10-22) days, respectively. A single larva of E. confrater consumed 442.74 sugarcane woolly aphids in its total larval period at a rate of 36.53 aphids/individual/day. The instarwise consumption was 45.83, 133.52 and 263.39 aphids during first, second and third instar, respectively. In the absence of food, Eupeodes late instar larvae fed on eggs, early and late instars of Micromus and early instars of Dipha. Inturn, the late instar Dipha larvae consumed early instar Eupeodes larvae. In the field study, molasses and fruit fly diet attractants recorded comparatively more syrphid larval population (1.13 and 0.92 larvae/leaf) and registered lower mean aphid grades. All the tested chemical insecticides viz., thiamethoxam, chlorpyriphos and malathion were found highly toxic to syrphids. However, the safest treatment was vitex + neem + lantana which recorded least reduction of syrphid population in treated plots (3.72 and 6.13%) as well as under laboratory condition (23.01% mortality). |
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Date |
2016-09-14T10:46:15Z
2016-09-14T10:46:15Z 2006 |
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Type |
Thesis
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Identifier |
http://krishikosh.egranth.ac.in/handle/1/76594
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Format |
application/pdf
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Publisher |
UAS, Dharwad
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