Influence of stripe disease [Drechslera graminea (Rabenh.) Shoemaker] on physio-biochemical parameters of barley and its management
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Date
2011
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Publisher
CCSHAU
Abstract
Stripe disease of barley caused by Drechslera graminea (Rabenh.) Shoemaker is a widely
distributed disease in many barley grown parts of the world, but it has assumed more importance
with the introduction of some new high yielding varieties. The present investigations were
undertaken during 2007-08 and 2008-09 crop seasons with a view of elicit information on effect of
disease on biochemical and physiological parameters particularly in vitro dry matter digestibility,
protein content, malt extract, chlorophyll content, leaf area, photosynthesis, stomatal conductance
and transpiration. Effect of disease on yield parameters, search for new sources of resistance, effect
of sowing dates on disease incidence and efficacy of fungitoxicants in controlling the disease.
In vitro dry matter digestibility (IVDMD) decreased and total protein (%) increased in
barley plants having disease, while malt extract (%) was more in grains collected from healthy
plants. Stripe infection resulted in reduction of all the physiological parameters at both the stages i.e.
35 days and 50 days after disease appearance.
Stripe disease had also the adverse effect on all the growth and yield parameters. Maximum
reduction was in tillers/plant i.e. 69.97% while the reduction in yield /plot (kg) was 29.03%.
Six rowed barley lines/varieties when compared with two rowed barley lines/varieties on the
basis of mean infection value, two rowed lines/varieties had more resistance than six rowed.
Grouping on the basis of mean infection value in six rowed barley 3 lines / varieties were highly
resistant, while in two rowed 4 lines / varieties were highly resistant.
In early sown crop i.e. 15th October there was no disease but in late sowings there was
disease. Soil moisture had the positive correlation with disease incidence with values 0.83 and 0.84.
Five fungitoxicants evaluated were significantly effective in controlling the disease at 0.1
and 0.2 per cent doses. Raxil-2DS at lower dose (0.1%) was quite effective with 2.75% disease on
plant and 1.08% tiller basis. However, Raxil-2DS and Vitavax-75WP at 0.2% were very effective and
provided maximum disease control on plant and tiller basis. Maximum yield was also obtained in
both the treatments.
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Keywords
Diseases, Planting, Biological phenomena, Barley, Sowing, Fungi, Developmental stages, Yields, Chlorophylls, Control methods