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Publisher: UHF,NAUNI
Language: en
Type: Thesis
Pages: 58+III
Agrotags: null
Keywords: mustard crop, biology and pollination efficiency ,syrphids
Abstract: ABSTRACT The present investigation entitled “Studies on biology and pollination efficiency of some syrphids associated with mustard crop” was carried out in the Department of Entomology, Dr. Y S Parmar University of Horticulture and Forestry, Nauni, Solan (HP). The biology and predation potential of Eupeodes frequens (Matsmura) and Episyrphus balteatus (Dee Geer) was studied on cabbage aphid (Brevicoryne brassicae) under laboratory conditions in growth chamber at 25±2oC temperature and 50-60 per cent relative humidity. The incubation, larval and pupal period of E. frequens was observed as 3.5, 12.4 and 11.9 days, respectively. The longevity of male and female was determined as 15.2±0.74 and 17.6±0.68 days, respectively. The incubation, larval, and pupal period of E. balteatus was determined as 3.8±0.16, 8.13.7±0.45 and 8.8±0.36 days, respectively. The longevity of male and female was recorded as 10.6±0.51 and 12.6±0.51 days, respectively. For both the species i.e. E. frequens and E. balteatus, irrespective of the sex (male and female), statistically maximum longevity of 21.21 and 14.36 days was observed, respectively. Statistically, maximum eggs (fecundity) 47.86 and 41.14 were observed respectively, for E. balteatus and E. frequens at 10 per cent honey solution and fresh mustard pollen grains. The pollination efficiency of E. balteatus and E. frequens was recorded on mustard bloom under field conditions, E. balteatus showed higher pollination index (6.93) than E. frequens (5.83), hence, E. balteatus was more efficient pollinator than E. frequens. From the study under caged conditions, it was observed that plants which were pollinated by E. balteatus and E. frequens showed 22.5 and 19.41 per cent increase in seed setting, 29.20 and 24.70 per cent in numbers of seeds per siliqua and 34.97 and 30.77 per cent increase in thousand seed weight over control, respectively
Subject: Entomology
Theme: mustard crop, biology and pollination efficiency ,syrphids
These Type: M.Sc
Issue Date: 2018-07
Appears in Collections:Theses

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