Effect of natural products on growth and development of Agrotis segetum (Denis and Schiffermuller)

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dc.contributor.advisorVerma, K.S.
dc.contributor.authorShiwani
dc.date.accessioned2022-02-18T09:08:29Z
dc.date.available2022-02-18T09:08:29Z
dc.date.issued2021-11-10
dc.description.abstractThe present investigation entitled “Effect of natural products on growth and development of Agrotis segetum (Denis and Schiffermuller)” was undertaken during 2020-2021 in the Department of Entomology, CSK HPKV, Palampur. The effect of natural products viz., Neemastra, Agniastra and Brahmastra at concentrations ranging from 2.5 to 40 per cent and azadirachtin at concentrations ranging from 1.25 to 20 ppm was studied on developmental biology of A. segetum under laboratory conditions on cabbage. The natural products impaired the normal development of A. segetum by prolonging the developmental period in dose dependent manner. However, the adult longevity, oviposition period, post-ovipostition period and fecundity were reduced with increasing concentrations of natural products. The maximum prolongation of incubation period (3.02 days), larval period (25.23 days), pre-pupal period (2.11 days), pupal period (10.02 days), pre-oviposition period (3.00 days) as compared to control 2.17, 20.97, 1.34, 9.04, 2.23 days, respectively was observed at 40 per cent concentration of Brahmastra. Brahmastra (40%) proved to be most effective, in reducing male longevity (9.54 days), female longevity (7.90 days), shortening oviposition period (2.49 days), post-ovipostition period (2.05 days) and reducing the fecundity (775.00 eggs) as compared to control 10.72, 8.92, 4.13, 2.68 days and 887.67 eggs, respectively. The survival percentage of each stage was reduced with increasing concentrations of natural products and maximum reduction was observed in Brahmastra (40%). The percent hatchability of eggs (93.33%), larval survival (51.11%), prepupal survival (52.22%), pupal survival (45.56%) and adult survival (45.56%) were reduced as compared to control 100.00, 84.44, 81.11, 78.89 and 78.89 per cent, respectively. Azadirachtin (1.25-20 ppm) had prolonged the incubation period, larval period, pre-pupal period, pupal period and pre-oviposition period ranging between 3.57-4.32, 26.10-29.17, 2.33-2.97, 10.94-11.58 and 2.70-3.44 days, respectively. The male longevity, female longevity, oviposition period, post-oviposition period and fecundity were reduced from 7.73 to 6.92, 6.17 to 5.31, 3.17 to 2.36, 1.92 to 1.36 days, respectively and 751.0 to 667.0 eggs at concentrations ranging from 1.25 to 20 ppm, respectively. The feeding inhibition (FI) studies of different natural products viz., Neemastra, Agniastra, Brahmastra and garlic+chilli extract in concentrations ranging from 2 to 32 per cent and azadirachtin concentrations ranging from 2 to 32 ppm were evaluated against 3rd and 6th instar larvae of A. segetum. Based on FI50 values, the order of feeding inhibition of the natural products tested against the third and sixth instar larvae was observed as: Brahmastra (5.81 and 6.61%)>Neemastra (6.12 and 7.04%)>garlic+chilli extract (6.39 and 7.49%)>Agniastra (6.44 and 8.62%), respectively. While the FI50 values of azadirachtin against these instars was calculated to be 4.90 and 5.15 ppm, respectively.en_US
dc.identifier.urihttps://krishikosh.egranth.ac.in/handle/1/5810182517
dc.keywordsBrahmastra,period,eggs,longevity.en_US
dc.language.isoEnglishen_US
dc.pages79en_US
dc.publisherPalampuren_US
dc.subEntomologyen_US
dc.themeTo study the effect of natural products on the developmental biology of A. segetum and to determine the deterrent activity of natural products against cutwormsen_US
dc.these.typeM.Scen_US
dc.titleEffect of natural products on growth and development of Agrotis segetum (Denis and Schiffermuller)en_US
dc.typeThesisen_US
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