Bioecology and management of whitefly, Bemisia tabaci (Gennadius) on brinjal

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dc.contributor.advisorAggarwal, Naveen
dc.contributor.authorGurmail Singh
dc.date.accessioned2022-02-24T10:54:21Z
dc.date.available2022-02-24T10:54:21Z
dc.date.issued2021
dc.description.abstractThe studies on bioecology and management of whitefly, Bemisia tabaci (Gennadius) on brinjal were conducted during 2018, 2019 and 2020 at Punjab Agricultural University, Ludhiana and KVK Sri Muktsar Sahib, Punjab. The biology of B. tabaci was studied under screen house conditions and data revealed that development period of eggs, 1st, 2nd, 3rd and 4th instar nymphs varied from 3-19, 3-6, 3-5, 2-5, 3-5 days, respectively. Total development period of immature stages (egg to adults) was shortest during August-September (19.28±0.87 days), followed by April-May (21.08±0.75 days) and February-March (31.08±1.17 days). The females outnumbered the male (sex ratio 1: 2.47) and mean fecundity ranged between 22-51 eggs per female. Non significant differences were observed in morphometric parameters of different developmental stages of B. tabaci during different seasons. B. tabaci completed 13 overlapped generations on brinjal under screen house condition and development period (egg to adult) varied from 18 to 71 days during different months. The population dynamics studies revealed that whitefly attained two peaks during 28-30th and 36-41st SMW on brinjal and seasonal fluctuations were primarily influenced by temperature, relative humidity and rainfall. Abiotic factors accounted for 36-70 per cent (R2) variations in whitefly population on brinjal, whereas, the role of biotic factor was on lower side. Economic threshold level (ETL) of B. tabaci on brinjal was determined and it was found that management decision should be taken at 9 adult per leaf to prevent the economic losses due to B. tabaci on brinjal. The survey on host range of B. tabaci revealed that whitefly survived on different host plants round the year and total 113 plants belonging to 88 genera in 30 families were recorded as hosts of B. tabaci in Punjab. The plants in family Asteraceae, Cucurbitaceae, Fabaceae, Solanaceae and Malvaceae were found to be the most preferred hosts. The oviposition preference and devolvement biology of B. tabaci varied among tested host plants and order of oviposition preference was cucumber > soybean > cotton > brinjal > tomato > S. nigrum. A relatively higher oviposition preference and lower survival of B. tabaci on soybean indicating its suitability as trap crop for management of B. tabaci. Six management modules were evaluated for their effectiveness against B. tabaci and it was observed that whitefly can be managed effectively and economically by installing yellow sticky traps @ 100 traps ha-1 in early growth stage of the brinjal crop, followed by need based two sprays of azadirachtin (1 %) @ 1000 ml ha-1en_US
dc.identifier.citationGurmail Singh (2021). Bioecology and management of whitefly, Bemisia tabaci (Gennadius) on brinjal (Unpublished Ph.D. Dissertation). Punjab Agricultural University, Ludhiana, Punjab, India.en_US
dc.identifier.urihttps://krishikosh.egranth.ac.in/handle/1/5810182840
dc.keywordsBrinjal, Bemisia tabaci, bioecology, biorational management, carryover, ETL, host rangeen_US
dc.language.isoEnglishen_US
dc.pages154en_US
dc.publisherPunjab Agricultural University, Ludhianaen_US
dc.research.problemBioecology and management of whitefly, Bemisia tabaci (Gennadius) on brinjalen_US
dc.subEntomologyen_US
dc.themeBioecology and management of whitefly, Bemisia tabaci (Gennadius) on brinjalen_US
dc.these.typePh.Den_US
dc.titleBioecology and management of whitefly, Bemisia tabaci (Gennadius) on brinjalen_US
dc.typeThesisen_US
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