STUDIES ON DIVERSITY, POPULATION DYNAMICS AND PREDATORY POTENTIAL OF SYRPHIDS AGAINST Brevicoryne brassicae (L.) INFESTING CRUCIFEROUS CROPS IN HIMACHAL PRADESH

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dc.contributor.advisorVERMA, SUBHASH CHANDER
dc.contributor.authorPALIAL, SHIVANI
dc.date.accessioned2023-05-16T11:10:14Z
dc.date.available2023-05-16T11:10:14Z
dc.date.issued2023-03
dc.description.abstractABSTRACT The present study entitled “Studies on diversity, population dynamics and predatory Pradesh” conducted during 2019-2022 at Department of Entomology, Dr. Y. S. Parmar University of Horticulture and Forestry, Nauni, Solan, Himachal Pradesh. A total 27 species of syrphids belonging to 12 genera were recorded from the four agroclimatic zones of Himachal Pradesh. The maximum number of syrphids were found in Zone-II (23) followed by Zone-I (17), Zone-III (13) and Zone-IV (11). The syrphid population appeared on the crop during 3rd-4th standard meteorological week which coincided with the appearance of cabbage aphid population in the field condition and the peak was recorded in the mid of March during both the cropping seasons. The population of E. balteatus, E. corollae, E. pseudonitens, I. scutellaris and S. indiana showed the significant and positive correlation with cabbage aphid and with maximum and minimum temperature except for S. pyrastri and B. isaaci whose population remained low during both the cropping seasons while non-significant correlation was observed with the relative humidity and total rainfall. The first, second and third instar larvae of E. balteatus, E. corollae, E. pseudonitens, I. scutellaris, S. indiana, S. pyrastri consumed on an average 21.70, 21.15, 24.2 , 11.84 , 9.10 and 12.70, 97.21, 71.70, 95.60, 46.75 and 81.53, 278.56, 287.10, 327.0, 272.17, 217.56 and 328.70 aphids, respectively. The maximum value of net predation rate (Co) was recorded for E. pseudonitens (430.14 aphids) whereas the gross reproductive rate (33.18 offspring/ individual), net reproductive rate (29.20 offspring/individual), intrinsic rate of increase (r=0.132), finite rate of increase (λ= 1.141), stable host- kill rate (ψ =18.63) and finite host- kill rate (ω =21.07) were recorded for E. corollae. Logistic regression analysis on the proportion of aphids consumed and the initial density of aphids confirmed the Type-II functional response for all the larval stages of syrphids. The third instar larva of syrphids was the most voracious feeder with the highest attack rate, shortest handling and highest prey consumption. Hence, among dominant syrphid predators, E. corollae is the potential predator against the cabbage aphid, B. brassicae and can be used in the integrated pest management programen_US
dc.identifier.urihttps://krishikosh.egranth.ac.in/handle/1/5810197323
dc.keywordspredatory, syrphids , Brevicoryne brassicae (L.), infesting cruciferous crops,Himachal Pradeshen_US
dc.language.isoEnglishen_US
dc.pages196+xxiiien_US
dc.publisherUHF,NAUNIen_US
dc.subEntomologyen_US
dc.themepredatory, syrphids , Brevicoryne brassicae (L.), infesting cruciferous crops,Himachal Pradeshen_US
dc.these.typePh.Den_US
dc.titleSTUDIES ON DIVERSITY, POPULATION DYNAMICS AND PREDATORY POTENTIAL OF SYRPHIDS AGAINST Brevicoryne brassicae (L.) INFESTING CRUCIFEROUS CROPS IN HIMACHAL PRADESHen_US
dc.typeThesisen_US
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