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Studies on Host plant resistance and Management of Thrips tabaci Lindeman in Onion

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Title Studies on Host plant resistance and Management of Thrips tabaci Lindeman in Onion
 
Creator Vijayalakshmi M.
 
Contributor Mahabaleshwar G. Hegde
 
Subject Agricultural Entomology
 
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).
 
Date 2016-11-22T13:02:33Z
2016-11-22T13:02:33Z
2013
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/86936
 
Format application/pdf
 
Publisher UAS, Dharwad