Integrated management of potato tuber moth, Phthorimaea operculella (Zeller) in storage

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dc.contributor.advisorChandel, R. S.
dc.contributor.authorWabhitkar, Mayur
dc.date.accessioned2022-02-09T09:08:56Z
dc.date.available2022-02-09T09:08:56Z
dc.date.issued2021-09-26
dc.description.abstractThe bioassay studies of novaluron and spinosad were conducted against eggs and larvae of P. operculella at Palampur. The LC50 values of novaluron and spinosad against eggs were calculated to be 0.003 and 0.004 per cent. Against larvae, both these novel insecticides were evaluated by spraying them on potato leaves. The LC50 values of novaluron for I-IV instar larvae of P. operculella were calculated to be 0.001, 0.003, 0.009 and 0.01 percent, respectively. In case of spinosad, the LC50 values for I-IV instar larvae were determined to be 0.0003, 0.0006, 0.001 and 0.002 per cent, respectively. The time-mortality response of novaluron and spinosad against larvae was worked out at different concentrations. The LT50 values in first, second, third and fourth instar larvae for novaluron were worked out to be 51.86, 45.03, 43.47 and 42.76 hours, respectively. The LT50 values of spinosad for I-IV instars were calculated to be 33.08, 42.41, 41.99 and 52.43 hours. In the present study four natural products viz; neemastra, agniastra, brahmastra and dashparni were tested at five different concentrations ranging from 10.0 to 40.0 per cent. Against first instar larvae, neemastra, brahmastra, agniastra and dashparni at 40.0 per cent concentration registered mortality ranging from 53.33 to 66.67 per cent, after five days of exposure. In case of second instar, these natural products produced 56.67 to 63.33 per cent mortality, at 40 per cent concentration. When third instar larvae were treated with these products at 40 per cent concentration, neemastra and dashparni produced 53.33 per cent mortality, while brahmastra and agniastra registered 46.67 and 43.33 per cent mortality, respectively. In case of fourth instar, neemastra, agniastra, brahmastra and dashparni at 40 per cent concentration produced 46.67, 36.67, 43.33 and 46.67 per cent kill, after five days of exposure, respectively. When different natural products were tested in different combinations using 10 per cent concentration in 1:1 ratio, the interaction seems to be of additive type, and no synergistic effect was observed. In storage experiment, minimum tuber damage (2.63%) was recorded in spinosad (0.01%), and novaluron (0.007%) registered 54.39 per cent tuber infestation, after 30 days of exposure. Among natural products, maximum damage 78.59 and 75.80 per cent was recorded in agniastra and dashparni. There was 70.51 and 73.01 per cent damage in neemastra and brahmastra treated tubers, respectively after 30 days of exposure. Novaluron and spinosad also revealed sublethal effects when one-day old eggs were treated. Maximum incubation period of 4.83 days was observed with novaluron (0.0003%), compared to 4.20 days in control. The total larval period was also recorded to be maximum in novaluron (0.0003%). There was considerable reduction in larval growth index in spinosad (0.00005%), and the larval growth index was calculated to be 3.42. The adult longevity was significantly affected, and the male and female longevity in novaluron treatment ranged from 4.73 and 4.64 days. In control, the male and female longevity has been found to range from 6.2 and 5.56 days, respectively.en_US
dc.identifier.urihttps://krishikosh.egranth.ac.in/handle/1/5810181941
dc.keywordsconcentrations,brahmastra,combinations,en_US
dc.language.isoEnglishen_US
dc.pages100en_US
dc.publisherPalampuren_US
dc.subEntomologyen_US
dc.themeTo investigate the potential of natural products,safer insecticides against potato tuber moth and to integrate different components for their effective utilization against potato tuber moth in storage.en_US
dc.these.typeM.Scen_US
dc.titleIntegrated management of potato tuber moth, Phthorimaea operculella (Zeller) in storageen_US
dc.typeThesisen_US
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