STUDIES ON FOLIAR DISEASES OF SESAME
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Date
1999
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University of Agricultural Science, Dharwad
Abstract
"Among several foliar diseases affecting sosaine corp alternaria leaf spot
caused by Altemaria sesami and white spot caused hy Cercospora sesami has
become a major constraint in sesame cultivation. Therefore, these foliar diseases
have been studied in detail with different objectives with an ultimate aim of the
control of these diseases.
Survey revealed that maximum disease severity of Altemaria leaf spot
was recorded from Dharwad taluk of Dharwad district and Basavakalyan taluk of
Bidar district. Among the 172 sesame genotypes including three wild species
screened against foliar diseases under filed conditions, three wild species viz,
Sesamum malabaricum, S. occidentalis and 5"". radiatiim were found resistant and
12 genotypes ( Kalika, DORS-2 DS-9, 10, 28, 57, Bijapur local (brown),
Tarikeri local, BSG-26, Kudalagi local, Madhavi and AVT-13) showed
moderately resistant reaction to Altemaria leaf spot.
In case of in vitro evaluation of nine fungicides, mancozeb and
Azadirectin @ 0.3%, difenconazole and propiconazole @ 0.1% against
Altemaria sesami and carbendazim @ 0.1% and mancozeb @ 0.3% against
Cercospora sesami were found most effective. Copper oxychloride and
Azadirectin (Nimbicidine) at all the concentrations tested were found least
effective in inhibition of mycelial growth of both the fungi.
In field evaluation of ten chemicals, 3 sprays of mancozeb (0.3%) +
streptocycline (0.25%) combination and mancozeb (0.3%) alone have
significantly reduced the severity of foliar diseases and increased the seed yield
and oil content."
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No. of references 84