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STUDIES ON ALTERNARIA LEAF BLIGHT OF SESAMUM (Sesamum indicum L.)

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Title STUDIES ON ALTERNARIA LEAF BLIGHT OF SESAMUM (Sesamum indicum L.)
 
Creator KRISHNA BABU, GABULANGI
 
Contributor KRISHNA MURTHY, K.V.M.
 
Subject fungi, diseases, sowing, biological development, extraction, planting, plant extracts, developmental stages, germinability, alternaria alternata
ALTERNARIA LEAF BLIGHT, SESAMUM (Sesamum indicum L.)
 
Description Alternaria alternata causing leaf blight disease on sesamum, was
isolated and identified. The effect of host age on the development of the
disease, survival and viability of the fungus in sesamum seeds, and antagonistic
effects of Trichoderma spp. and the effect of leaf extracts on the growth and
spore germination of A. alternata, effect of culture filtrate of Trichoderma spp.
on the growth and spore germination of Alternaria alternata, and efficacy of
leaf extract and bio-control agent and Propiconazole in the management of leaf
blight of sesamum were studied.
Sesamum plants were susceptible to A. alternata at different ages.
However seventy five days old plants were more susceptible.
The survival and viability of A. alternata in sesamum seed was higher in
seed stored for 30 days in both agar and blotter paper methods. The fungus
significantly showed a reduction with increase in storage period, even though
the fungus could be isolated from the seed even after 120 days.
Sesamum seeds stored in cloth bags showed more incidence of A.
alternata than the seed stored in gunny bag and open heap.
Sesamum seed stored at 250C showed more colonization by A. alternata
than the seed stored at 300C, 350C and 400C.
The leaf extracts of Azadiracta indica followed by those of Eucalyptus
terticornis, and Calotropis procera, were found to be effective in inhibiting the
growth and spore germination of A. alternata whereas the leaf extracts of
Vinca rosea were least effective in reducing fungal growth and spore
germination.
The biocontrol agents viz., Trichoderma virens, T. longibrachiatum,
T. harzianum and T. reesei were found to be superior in inhibiting the growth
and germination of A. alternata.
The culture filtrate of Trichoderma virens isolate 8 was found to be the
most effective in inhibiting the growth of A. alternata. T. harzianum isolate 2
was found to be the most inhibitory to spore germination. T. reesei isolate 1
was the least effective in inhibiting growth and spore germination.
In pot culture experiments under both natural and artificially inoculated
conditions Propiconazole (0.1%) followed by T. harzianum isolate 2 and leaf
extract of neem in combination reduced severity of Alternaria leaf blight and
increased plant height and pod yield of sesamum over control.
 
Date 2016-06-03T10:56:00Z
2016-06-03T10:56:00Z
2011
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/66698
 
Language en
 
Relation D9026;
 
Format application/pdf
 
Publisher ACHARYA N. G. RANGA AGRICULTURAL UNIVERSITY