ISSN:
1573-5060
Keywords:
wheat
;
Triticum aestivum
;
resistance selection
;
disease complexes
;
pathogen mixtures
;
septoria nodorum blotch
;
Leptosphaeria nodorum
;
septoria tritici blotch
;
Mycosphaerella graminicola
;
yellow spot
;
tan spot
;
Drechslera tritici-repentis
;
Pyrenophora tritici-repentis
Source:
Springer Online Journal Archives 1860-2000
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
Summary In controlled inoculation studies with Septoria nodorum and Pyrenophora tritici-repentis, estimates of the relative proportion of each pathogen demonstrated differences in the responses of cultivars to pathogen mixtures that were not apparent from measurements of diseased leaf areas. Under field conditions estimates of the relative proportion of S. nodorum, P. tritici-repentis and S. tritici varied between field screening locations in Western Australian but also between lines within locations. Lines with known resistance to P. tritici-repentis and S. tritici, but susceptible to S. nodorum, could not be distinguished from susceptible lines on the basis of leaf area diseased or grain weight depression when S. nodorum was present in the disease complex. Such conditions, while suitable for the selection of combined resistance to these pathogens, were unsuitable for identifying resistance to individual pathogens. As symptoms were similar, the proportion of diseased leaf area sporulating with each pathogen provided a means of measuring the variation in disease development induced on lines varying in resistance. Knowledge of the components of disease and their relative importance were essential in understanding varietal response information under mixed infections of these leaf spot pathogens.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00023770
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