National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
Functional response of the syrphids Episyrphus balteatus deGeer, Eristalis interruptus (Poda), Eristalis cerealis F. and Sphaerophoria scripta (L.), to Brevicoryne brassicae L. was studied under laboratory conditions to determine their relative preying potential. The 2nd and 3rd instar larvae of the predators were exposed to increasing densities of similar sized B. brassicae nymphs in petri dishes. Third instar of Ep. balteatus was found to possess highest consumption (52.8 aphids) closely followed by Er. Cerealis (50.7 aphids), Er. Interruptus (42.10 aphids) and S. scripta (38.7 aphids), All predators and preying stages exhibited type II functional response. The coefficients of attack rate and handling time were found to show significant variation between species and preying stages. The results suggested that third instar larva of Episyrphus balteatus is the efficient predator to regulate B. brassicae colonies.
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