Symptomatology, Histopathology and Management of Stripe Disease of Barley (Hordeum vulgare L.) caused by Drechslera graminea (Rabenh Ex Schlecht) Shoemaker
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Date
2007
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MPUAT, Udaipur
Abstract
The present investigastions on “Symptomatology, Histopathology and Management of Stripe disease of Barley (Hordeum vulgare L.) caused by Drechslera graminea (Rabenh Ex Schlecht) Shoemaker” were undertaken, where Drechslera graminea has been found to be closely associated with the stripe disease of barley.
In cultural studies the maximum mycelial growth and sporulation of Drechslera graminea were recorded on potato dextrose agar culture medium having pH 6.5 at 30oC temperature, the mycelial growth and sporulation however declined gradually with a little fluctuation in pH and temperature levels as specified.
The fungal infection initially appeared in the form of small yellow spots, which later elongated into yellow brown stripe starting from the base and extending upto the tip of leaf causing necrosis of the infected tissue. The necrotic tissues revealed abundant subhyaline to dark brown coloured characterstic conidia observed under microscope.
In histopathological studies hyaline, branched intercellular mycelial structures could be deciphered in infected tissus of leaves, stems and roots. In infected seeds mycelium was seen in pericarp of seeds.
The leaf stripe disease development in 2005 was higher as compared to that of 2004 incidence as the assessment of losses during 2005 revealed that there was overall reduction of 37.5% in ears/plant corresponding both to 37.6% fewer grains and 62.3 per cent decreased grain weight. The loss in grain yield and fodder yield per hactare at 6.9% disease incidence were 175.7 Kg and 124.5 Kg, respectively.
The most favourable conditions required for development of disease in field conditions as observed for two years are conclusively maximum temperature between 23 to 28oC, minimum temperature between 7 to 10oC, maximum relative humidity about 82 per cent or above and sunshine 7 to 9 hours, occasional rain did help in the disease progress.
In field conditions, leaf stripe systemic infection was most usually observed on the plants sowing of which was done after 22 October. The most susceptible stage of barley was 40 days old plants though disease readily developed at 10 to 60 days old plants. The development of leaf stripe disease was favoured by deep placement (6 cm) of seed in the soil as compared to normal sowing depth.
Of the fungicides tested in vitro, Vitavax completely inhibited the mycelial growth of D. graminea at concentration of 50 ppm followed by Thiram and Captan at 250 ppm concentration. The out of four plant extracts, Lantana camara extract inhibited the mycelial growth of fungus. Trichoderma harzianum also inhibited mycelial growth of fungus in vitro. Vitavax considerably reduced the PDI both in pot and field experiments.
Out of 31 barley varieties, 10 entries exhibited resistant reaction while others were moderately tolerant and susceptible to Drechslera graminea.
Description
Stripe disease management in barley
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Citation
Yadav, S.C. and Gour, H.N. 2007