Studies on loose smut of barley caused by ustilago nuda (Jens) rostr.
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Date
2007
Authors
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Journal ISSN
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Publisher
CCSHAU
Abstract
Investigations were carried out on the management of loose
smut disease of barley through chemicals, biological means, plant
extracts, sowing dates, and host resistance. The effect of loose
smut on barley crop revealed that there was maximum reduction in
ear head length up to 60 per cent followed by flag leaf area 45.47 per
cent.
Among 45 barley varieties/entries screened under artificially
inoculated conditions, none was found resistant, while 18 entries were
moderately resistant, 6 moderately susceptible, 5 susceptible and 16
highly susceptible against loose smut disease. Out of six fungitoxicants
tested as seed treatment Raxil and Vitavax @0.2% were found very
effective and provided 100 per cent disease control and superior than
Bavistin, Pulsor and Thiram. Four antagonistic micro-organisms
namely T. viride, T. harzianum, A. chroococcum and B. subtilis were
also tested for biocontrol of this disease. Seed treatment with B.
subtilis and T. viride provided maximum disease control i.e. 42.48,
41.29 and 40.69, 38.06 per cent on plant as well as tiller basis,
respectively.
Among six plant leaf extracts tried against the disease, seed
treatment with neem leaf extract was found to be most effective and
gave maximum control i.e. 60.69 and 83.51 per cent on both plant
and tiller basis. There was minimum disease i.e. 29.16 and 16.33 per
cent on plant as well as tiller basis in late sowing as compared to early
sown crop i.e. 42.40 and 28.13 per cent.
Description
Keywords
Barley, Hordeum vulgare, Varietal resistance, Fungicides, Bioagents, Plant extracts