Studies on Host plant resistance and Management of Thrips tabaci Lindeman in Onion
KrishiKosh
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Title |
Studies on Host plant resistance and Management of Thrips tabaci Lindeman in Onion
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Creator |
Vijayalakshmi M.
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Contributor |
Mahabaleshwar G. Hegde
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Subject |
Agricultural Entomology
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Description |
Thrips is an important insect pest responsible for reduction of onion bulb yield. Screening of 17 onion genotypes for thrips resistance revealed that Cv. Bidar–I and Krishnavaram were resistant and Bidar-II (White), Gadag local (White), Belgaum local (White), Bidar district (Nizam local) were moderately resistant. The nasik red supported higher number of thrips population and was highly susceptible to thrips. The biophysical and biochemical characters of genotypes were correlated with thrips population. The results revealed that leaf angle and leaf water content had negative and highly significant relationship with thrips population. The leaf color and leaf thickness (without press) at bottom, middle and top was positively correlated and all the correlations were significant with thrips population. Total phenols and tannin contents exhibited negative significant correlation, where as total sugars and soluble amino acids exhibited a positive significant correlation with thrips population. Six colored sticky traps were evaluated for their preference to thrips, leafhoppers and coccinellids, both in wind ward and lee ward direction. Yellow sticky trap caught maximum number of thrips and leafhoppers, was at par with blue sticky trap. Red sticky trap caught moderate number of thrips, leafhoppers and least number of coccinellids. Spinosad 45 SC @ 0.25 ml/l consistently proved to be the best insecticide in checking thrips population was at par with thiamethoxam 25 WG @ 0.2 g/l and imidacloprid 17.8 SL @ 0.25 ml/l. Among botanicals and biopesticides neem crude oil @ 40 ml/l and Lecanicillium lecanii @ 2 g/l recorded comparatively lower number of thrips. Pongamia oil 40 ml/l, dashparni 50 ml/l and neem crude oil 40 ml/l recorded higher number of coccinellids and spider population after spray. The highest bulb yield and net profit was recorded in spinosad (33.05 t/ha). |
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Date |
2016-11-22T13:02:33Z
2016-11-22T13:02:33Z 2013 |
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Type |
Thesis
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Identifier |
http://krishikosh.egranth.ac.in/handle/1/86936
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Format |
application/pdf
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Publisher |
UAS, Dharwad
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