Effect of inoculum density of Cochliobolus sativus on common root rot of wheat and barley

In a growth room study, the incidence (percentage of plants with symptoms) and intensity (severity of symptoms) of common root rot in the artificially inoculated spring wheat, cultivars Neepawa (moderately resistant) and Cypress (susceptible) and the spring barley, cultivars Bonanza (moderately resistant) and Melvin (susceptible) increased as the number of soilborne conidia of Cochliobolus sativus increased. Maximum disease intensity levels in the wheat and barley cultivars were attained with 10-60 and 50-120 conidia/cm3, respectively. In spite of disease incidence reaching 100% in many cases, the disease intensity was never higher than 75%. As inoculum density increased, the susceptible cultivars became relatively more severely diseased than the moderately resistant cultivars.

[1]  P. Verma.  Temporal progression of common root rot [Cochliobolus sativus] lesions on subcrown internodes of wheat and barley cultivars , 1982 .

[2]  Luc Couture,et al.  Assessment of severity of foliage diseases of cereals in co-operative evaluation tests. , 1980 .

[3]  R. D. Tinline,et al.  YIELD LOSSES IN WHEAT AND BARLEY CULTIVARS FROM COMMON ROOT ROT IN FIELD TESTS , 1979 .

[4]  S. Chinn.  Influence of Fungicide Sprays on Sporulation of Cochliobolus sativus on Cypress Wheat and on Conidial Populations in Soil , 1977 .

[5]  J. Mills,et al.  Barley losses due to common root rot in the prairie provinces of Canada, 1970-72. , 1976 .

[6]  S. Chinn.  INFLUENCE OF RAPE IN A ROTATION ON PREVALENCE OF COCHLIOBOLUS SATIVUS CONIDIA AND COMMON ROOT ROT OF WHEAT , 1976 .

[7]  G. Stringam.  Genetics of four hypocotyl mutants in Brassica campestris L. , 1971 .

[8]  S. Chinn,et al.  SPORE POPULATIONS OF HELMINTHOSPORIUM SATIVUM IN SOILS IN RELATION TO THE OCCURRENCE OF COMMON ROOTROT OF WHEAT , 1962 .

[9]  D. Krishnamurti.  The Raman spectrum of rutile , 1962 .

[10]  S. Chinn,et al.  MECHANISMS CONTRIBUTING TO THE ERADICATION OF SPORES OF HELMINTHOSPORIUM SATIVUM FROM AMENDED SOIL , 1961 .

[11]  R. Ledingham.  CROP ROTATIONS AND COMMON ROOTROT IN WHEAT , 1961 .

[12]  J. Stauffer,et al.  COCHLIOBOLUS SATIVUS: III. EFFECT OF ULTRAVIOLET RADIATION , 1960 .

[13]  S. Chinn,et al.  APPLICATION OF A NEW LABORATORY METHOD FOR THE DETERMINATION OF THE SURVIVAL OF HELMINTHOSPORIUM SATIVUM SPORES IN SOIL , 1958 .