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Studies on syrphid predators of sugarcane woolly aphid (ceratovacuna lanigera zehntner)

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Title Studies on syrphid predators of sugarcane woolly aphid (ceratovacuna lanigera zehntner)
 
Creator Likhil E.K.
 
Contributor C.P.Mallapur
 
Subject Agricultural Entamology
 
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).
 
Date 2016-09-14T10:46:15Z
2016-09-14T10:46:15Z
2006
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/76594
 
Format application/pdf
 
Publisher UAS, Dharwad