The epidemiology of common root rot in Manitou wheat: disease progression during the growing season

1974 ◽  
Vol 52 (7) ◽  
pp. 1757-1764 ◽  
Author(s):  
P. R. Verma ◽  
R. A. A. Morrall ◽  
R. D. Tinline
Keyword(s):  
Triticum Aestivum ◽  
Disease Severity ◽  
Plant Development ◽  
Root Rot ◽  
Growing Season ◽  
Cochliobolus Sativus ◽  
Infection Rates ◽  
Common Root ◽  
Common Root Rot ◽  
Disease Rating

Common root rot in Triticum aestivum cultivar Manitou caused primarily by Cochliobolus sativus was followed during plant development in 1969, 1970, and 1971 at Matador, Saskatchewan. Plants were sampled at intervals, and three variables based mainly on the occurrence of lesions on subcrown internodes were studied: number of diseased plants per square meter; percentage of diseased plants; and disease rating which integrated percentage of diseased plants and disease severity on each plant. All variables increased with time, and the progression curves in all 3 years were hyperbolic, indicating that the increases were like those of a simple interest disease as described by Van der Plank. In two of the years, almost 100% of the plants were diseased considerably before the end of the season. The transformation proposed by Van der Plank for simple interest diseases, log10[1/(1 − x)], was applied to the percentages of diseased plants, and regressions were calculated. The slopes of these lines (infection rates) were as follows: 1969, 0.99% plants per day; 1970, 1.32%; and 1971, 1.96%. In 1969 the onset of disease was later than in 1970 and 1971, and there was correspondingly less disease at the end of the growing season.

The effect of common root rot on components of grain yield in Manitou wheat

1976 ◽  
Vol 54 (24) ◽  
pp. 2888-2892 ◽  
Author(s):  
P. R. Verma ◽  
R. A. A. Morrall ◽  
R. D. Tinline
Keyword(s):  
Triticum Aestivum ◽  
Grain Yield ◽  
Disease Severity ◽  
Root Rot ◽  
Major Effect ◽  
Kernel Weight ◽  
The Other ◽  
Cochliobolus Sativus ◽  
Common Root ◽  
Common Root Rot

The effects of common root rot (Cochliobolus sativus) on components of grain yield in naturally infected Triticum aestivum cultivar Manitou were studied at Matador, Saskatchewan, by sampling plants at maturity in 1969, 1970, and 1971. Plants were sorted into severe (SE), moderate (MO), slight (SL), and clean (CL) categories based mainly on the extent of lesions on the subcrown internodes. The number of tillers per plant, the number and weight of grains per head, the weight per head, and the 1000-kernel weight in each category were determined. Increasing values of all five components were consistently associated with decreasing disease severity. SE was mostly significantly different from the other three categories in all components except 1000-kernel weight; differences between SL and MO were usually non-significant. CL and SL were mostly significantly different for the number of tillers per plant and weight per head but non-significant for the weight and number of grains per head and 1000-kernel weight. Apparently, the major effect of common root rot was to reduce the number of tillers per plant and number of grains per head.

The epidemiology of common root rot in Manitou wheat. II. Effects of treatments, particularly phosphate fertilizer, on incidence and intensity of disease

1975 ◽  
Vol 53 (12) ◽  
pp. 1230-1238 ◽  
Author(s):  
P. R. Verma ◽  
R. D. Tinline ◽  
R. A. A. Morrall
Keyword(s):  
Triticum Aestivum ◽  
Soil Type ◽  
Root Rot ◽  
Growth Stage ◽  
Phosphate Fertilizer ◽  
Cochliobolus Sativus ◽  
Common Root ◽  
Common Root Rot

The effects of various treatments such as herbicide, irrigation, nitrogen, phosphate, and combinations of nitrogen and phosphate on common root rot (Cochliobolus sativus) in naturally infected Triticum aestivum cultivar ‘Manitou’ were studied at Matador, Saskatchewan, by sampling plants at intervals during 1969, 1970, and 1971. The treatments were compared for each of the following variables : number of diseased plants per square metre, percentages of diseased plants, and percentage disease ratings. Usually, disease assessed by each variable was higher in the checks than in the phosphate treatments. The effect of phosphate appeared maximal at midseason (growth stage 9–10.5). The differences between treatments such as herbicide, nitrogen, and irrigation and the checks were insignificant. A comparison with the results of other workers suggests interaction between phosphate and soil type, and between phosphate and cultivar.

RESISTANCE IN WHEAT TO COCHLIOBOLUS SATIVUS, A CAUSE OF COMMON ROOT ROT

1965 ◽  
Vol 45 (4) ◽  
pp. 343-351 ◽  
Author(s):  
B. J. Sallans ◽  
R. D. Tinline
Keyword(s):  
Root Rot ◽  
Practical Method ◽  
Cochliobolus Sativus ◽  
Common Root ◽  
Fusarium Spp ◽  
Natural Field ◽  
Common Root Rot ◽  
Record Data ◽  
Disease Rating ◽  
High Level

Resistance in wheat to Cochliobolus sativus, the main cause of common root rot in cereals, was shown to be a heritable character. Crosses were made between Thatcher, McMurachy, Willet, 492 (P.I. 94562-1), and 182 (PI. 4309), all of which have shown some resistance to C. sativus but can become heavily infected. The crosses gave rise to both highly resistant and highly susceptible lines that were consistent in their root-rot reaction at four or five locations over 2 years. A simple, practical method was evolved to determine the root-rot reactions of lines and it was basic to their selection. It relies upon natural field infections and is oriented to obtain a high level of disease of the plants. The pedigree method of plant breeding was used to overcome the problem posed by the tendency for many plants to escape infection. Isolations of organisms from lesions gave assurance that the observed resistance was for C. sativus and not for Fusarium spp., which may also cause common root rot. A simplified disease rating was used to record data on the basis of two classes, essentially, resistant and susceptible.

The effect of common root rot on the yield of resistant and susceptible wheat

1996 ◽  
Vol 76 (4) ◽  
pp. 869-877 ◽  
Author(s):  
R. L. Conner ◽  
G. C. Kozub ◽  
K. L. Bailey
Keyword(s):  
Disease Severity ◽  
Root Rot ◽  
Field Tests ◽  
Cochliobolus Sativus ◽  
Common Root ◽  
Back Cross ◽  
Common Root Rot ◽  
The Impact ◽  
Disease Free

The impact of common root rot, caused by Cochliobolus sativus, on the yield of mixtures of resistant and susceptible backcross-6 derivative lines of Neepawa and Chester wheat was examined in field tests at three locations between 1991 and 1994. Different blends consisting of all 25% incremental combinations of resistant and susceptible back-cross lines within each cultivar were evaluated for disease severity and yield at root rot nurseries and disease-free sites. Significant (P < 0.05) differences in yield were often detected among cultivars. However, within cultivars, no consistent yield differences were observed among blends of resistant and susceptible lines of the same cultivar regardless of root rot severity. Key words:Cochliobolus sativus, common root rot, yield, wheat

INHERITANCE OF THATCHER-TYPE RESISTANCE TO COMMON ROOT ROT IN SPRING WHEAT

1968 ◽  
Vol 48 (5) ◽  
pp. 479-486 ◽  
Author(s):  
Hugh McKenzie ◽  
T. G. Atkinson
Keyword(s):  
Triticum Aestivum ◽  
Spring Wheat ◽  
Root Rot ◽  
Recessive Gene ◽  
Cochliobolus Sativus ◽  
Common Root ◽  
Wheat Stem Sawfly ◽  
Common Root Rot ◽  
Resistant Varieties ◽  
Stem Solidness

Inheritance of reaction to common root rot, caused chiefly by Cochliobolus sativus, was studied in F3 populations of wheat, Triticum aestivum, from crosses between the root-rot-resistant, hollow-stemmed varieties, Thatcher and Pembina, and the moderately root-rot-susceptible, solid-stemmed variety, CT 733. The results indicated that the resistance of Thatcher and Pembina, which appear to have the same gene complement, is controlled by a major recessive gene and one or two minor genes.No association was found between inheritance of root-rot reaction and the inheritance of stem solidness which determines resistance to the wheat stem sawfly (Cephus cinctus). Therefore, there should be no difficulty in incorporating root-rot resistance into sawfly-resistant varieties.

Multiple infections of subcrown internodes of wheat (Triticum aestivum) by common root rot fungi

1977 ◽  
Vol 55 (1) ◽  
pp. 30-34 ◽  
Author(s):  
R. D. Tinline
Keyword(s):  
Triticum Aestivum ◽  
Root Rot ◽  
Fusarium Culmorum ◽  
Cochliobolus Sativus ◽  
Multiple Infections ◽  
Common Root ◽  
Fusarium Spp ◽  
Common Root Rot ◽  
Fusarium Sp

In the greenhouse, subcrown internodes of wheat plants were inoculated with Cochliobolus sativus (Ito & Kurib.) Drechsler ex Dastur, Fusarium culmorum (W. G. Smith) Sacc., F. acuminatum Ell. & Ev., or F. sulplureum Schlecht. and at various times subsequently with C. sativus; or the internodes were inoculated with C. sativus and subsequently with it or a Fusarium sp. Using isolation of the fungi as the criterion for infection, it was found that prepossession of the internode by C. sativus did not prevent later invasion by it or by the fusaria; however, C. sativus was a relatively unsuccessful challenger to F. culmorum and F. acuminatum. The results suggest that when C. sativus and one of these two Fusarium spp. appear together in isolations from common root rot diseased plants that the initial invader was C. sativus.

REACTION OF SPRING BARLEYS TO COMMON ROOT ROT AND ITS EFFECT ON YIELD COMPONENTS

1984 ◽  
Vol 64 (2) ◽  
pp. 245-253 ◽  
Author(s):  
W. E. GREY ◽  
D. E. MATHRE
Keyword(s):  
Root Rot ◽  
Yield Components ◽  
Genetic Relationships ◽  
Kernel Weight ◽  
Cochliobolus Sativus ◽  
Yield Reduction ◽  
Common Root ◽  
Common Root Rot ◽  
Significant Difference ◽  
Disease Rating

The effects of common root rot (CRR), caused primarily by Cochliobolus sativus, on yield components in 16 barley cultivars representative of three groups—two-row (Hannchen and Smyrna types), Coast, and Manchuria—were studied at Bozeman and Glasgow, Mont, in 1980. At Bozeman, autoclaved oat kernels colonized by Cochliobolus sativus added with seed, effected a mean disease rating (DR) among the cultivars of 42.8, compared to 30.3, when autoclaved uncolonized oat kernels were added. In spite of the mean increase in disease severity of the inoculated plots, there was no significant difference in yield between inoculated and noninoculated plots. Later developed yield components, i.e. kernels per spike and kernel weight, compensated for the initial reduction in fertile tillers caused by CRR. Therefore, in population of plants under disease pressure from CRR, compensating effects on yield components may allow for little or no overall yield reduction, particularly in cultivars that are not highly susceptible to CRR. The two-row, Hannchen-type cultivars were all intermediate in DR at both locations. The two-row, Smyrna-type cultivars were high in susceptibility at Glasgow but intermediate in reaction to CRR at Bozeman. The six-row, Manchuria-Coast groups of cultivars were more diverse in their reaction to CRR at both locations. It appears that genetic relationships have more influence on a cultivar’s disease rating to CRR than has grouping based upon physiological characteristics.Key words: Barley groups, Cochliobolus sativus, yield components

Four interspecific germplasm lines (302–1, 302–3, 302–5, 302–20) of spring wheat with resistance to common root rot (Cochliobolus sativus) derived from Aegilops ovata

1995 ◽  
Vol 75 (3) ◽  
pp. 693-694 ◽  
Author(s):  
K. L. Bailey ◽  
H. Harding ◽  
P. Hucl
Keyword(s):  
Triticum Aestivum ◽  
Spring Wheat ◽  
Root Rot ◽  
Mixing Time ◽  
Peak Height ◽  
Common Root ◽  
Genetic Stock ◽  
Breeding Lines ◽  
Common Root Rot ◽  
Sedimentation Volume

Germplasm resistant to common root rot was developed from crossing Aegilops ovata with Triticum aestivum, using Chinese Spring ph 1b genetic stock and the cultivar Leader. The germplasm lines had yellow flour pigment and a longer mixing time and lower SDS sedimentation volume, falling number, and mixograph peak height than Leader. Yet, for most agronomic and quality traits, the germplasm was similar to that of Leader and Neepawa. Seed was classed as CWRS. This germplasm represents a different source of genes for resistance to common root rot than currently available in red spring wheat cultivars or breeding lines. Key words: Common root rot, resistance, Aegilops ovata, Triticum aestivum, germplasm

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