FAUNISTIC STUDIES ON SYRPHIDS IN DIFFERENT AGRO-ECOSYSTEMS
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Date
2022-01-10
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Abstract
The study was carried out at GKVK campus of the University of Agricultural Sciences, Bengaluru. Syrphid flies were collected using sweep net, malaise traps and rearing methods from different districts of Karnataka, Kerala, Uttarakhand and Andhra Pradesh between October, 2019 - November, 2021. A maximum of 90.34 per cent of the specimens were collected by sweepnet, followed by malaise trap (4.13%) and by rearing
larvae on different hosts (5.51%). Syrphids were collected from seven different
ecosystems, of which the highest numbers (53.82%) were collected from agro ecosystem. Whereas, numbers collected from forest land, grass land, meadows, flower ecosystem, fallow land and wet land were 15.27, 12.98, 11.45, 4.20, 1.53 and 0.76 per cent, respectively. Among the agricultural ecosystem, highest number of specimens were
collected from finger millet ecosystem. Magggots of Serratoparagus serratus Fabricius,
1805, Allobaccha amphithoe Stuckenberg, 1954 and Ischiodon scutellaris Fabricius, 1805 were reared from ragi root aphid (Tetraneura nigriabdominalis Sasaki, 1899), flatid
(Siphanta sp. Stal, 1860) and cabbage aphid (Brevicoryne brassicae Linnaeus, 1758),
respectively. Whereas, three species of syrphids namely Dideopsis aegrota Fabricius,
1805, Betasyrphus linga Ghorpade, 1994 and Ischiodon scutellaris Fabricius, 1805 were
reared on redgram aphid (Aphis craccivora Koch, 1854). A total of 289 specimens of syrphid flies belonging to 3 sub-families, 8 tribes, 18 genera and 23 species have been
reported and described. Male genitalia of 16 of the 23 species have been illustrated. In the present study, the species Microdon bellus Brunetti, 1923 and Monoceromyia
eumenioides Saunders, 1842 were first report from South India.
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