STUDIES ON SEED-BORNE FUNGAL DISEASES OF SUNFLOWER AND THEIR MANAGEMENT WITH SPECIAL REFERENCE TO THE ALTERNARIA BLIGHT
Loading...
Date
2007-08-31
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
University of Agricultural Sciences GKVK, Banglore
Abstract
Seed health testing of sunflower seed samples collected from
different parts of Karnataka revealed the dominance of Altemaria
helianthi and Rhizoctonia bataticola. Among the different seed health
testing methods, modified P.O.A method was found to be good for
detecting the seed-borne infection of A.helianthi, A.altemata and
R.bataticola. Infected sunflower seeds exhibited poor germination and
vigour.
The pathogenic ability of seed-borne A.helianthi and R.bataticola
was proved in seedling symptom test and transmission study. Altemaria
helianthi, A.altemata and R.bataticola were confined to only pericarp and
endosperm, but not embryo. In epidemiological studies, significant
difference in blight incidence was noticed between three different seed
inoculum levels at different dates of sowing and maximum incidence was
observed in July second fortnight sown crop at 30 and 60 DAS at a seed
inoculum level of 8000 conidia per ml.
Seed dressing fungicide viz., Carbendazim + Iprodione, bioagent-
Pseudomonas fluorescens and botanical Azadirachta indica were found
most effective in eliminating seed-borne infections of Altemaria,
Rhizoctonia and other fungal contaminations. In the integrated seed
treatment options, though the seed treatment with Carbendazim +
Iprodione at 0.3 per cent in Poly Ethylene Glycol along with foliar spray
of hexaconazole recorded least per cent disease index, seed treatment
with Carbendazim + Iprodione at 0.3 per cent in water along with foliar
spray of hexaconazole was found most effective in managing Altemaria
blight with maximum benefit cost ratio. In storage, seeds treated with
Carbendazim + Iprodione at 0.3 per cent and stored in 700 gauge poly
ethylene bags maintained satisfactory germination and seedling vigour
up to ten months of storage.
Description
Keywords
null