IN VITRO AND FIELD EVALUATION OF DIFFERENT SILICON SOURCES AGAINST SELECTED DISEASES IN TOMATO (Solanum lycopersicum L.)
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Date
2016-12-27
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UNIVERSITY OF AGRICULTURAL SCIENCES GKVK, BENGALURU
Abstract
Studies on evaluation of different silicon sources against major diseases of tomato
viz., early blight, late blight, powdery mildew and bacterial wilt were carried out during
2014-16. The studies revealed that, silicon sources inhibited the growth of Alternaria
solani (15.67 to 87.50 %), Phytophthora infestans (1.12 to 90.37 %), Oidium
neolycopersici (67.40 to 100 %) and Ralstonia solanacearum (0.08 to 2.44 OD @ 600
nm) at different concentrations under in vitro condition. Silixol plus @ 4 ml L-1 found
most effective in inhibiting A. solani, P. infestans and O. neolycopersici, whereas, OSAB
@ 4 ml L-1 against R. solanacearum under in vitro condition. OSAB @ 4 ml L-1 as foliar
spray three times at 15 days intervals effectively reduced the disease severity of powdery
mildew (55.50 %) under pot culture study, late blight (50.43 %) and early blight (33.15
%) under field condition whereas, OSAB @ 4 ml L-1 as seedling dip followed by soil
application (10 and 20 DAP) reduced the bacterial wilt incidence by 77.33 per cent in pot
culture study and 67.80 per cent under field condition besides reducing the soil and
rhizosphere population of R. solanacearum at both flowering and harvesting stage.
Seedling dip, soil and foliar application of OSAB and Silixol plus @ 4 ml L-1 also
increased plant height, number of branches, fresh and dry shoot weight, silicon content,
yield and chlorophyll content (SPAD values) besides increased activity of defense related
enzymes (peroxidase, polyphenol oxidase, phenylalanine ammonia lyase, β-1, 3
glucanase, chitinase, soil urease and sucrose activity) during post application.
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