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Disease spread of non‐specialised fungal pathogens from inoculated point sources in intraspecific mixed stands of cereal cultivars
Author(s) -
JEGER M. J.,
JONES D. GARETH,
GRIFFITHS ELLIS
Publication year - 1983
Publication title -
annals of applied biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 80
eISSN - 1744-7348
pISSN - 0003-4746
DOI - 10.1111/j.1744-7348.1983.tb02689.x
Subject(s) - biology , cultivar , septoria , inoculation , biological dispersal , crop , host (biology) , intraspecific competition , agronomy , horticulture , poaceae , botany , ecology , population , demography , sociology
SUMMARY Spread of Septoria nodorum from inoculated point sources was examined in pure stands and mixtures of two spring wheat cultivars Kolibri and Maris Butler. Gradients in disease were observed soon after inoculation; the presence of the more resistant cultivar (Maris Butler) in the mixtures retarded the outward spread of disease compared with the susceptible pure stand (Kolibri). Regression analysis suggested that gradients in incidence were influenced by nearness to the source whereas gradients in severity were not. Spread of disease was also examined in pure stands and mixtures for the host/pathogen combinations, winter wheat (cvs Maris Huntsman and Maris Ranger)/ S. nodorum and winter barley (cvs Maris Otter and Hoppel)/ Rhynchosporium secalis. In contrast to the spring wheat experiment, no gradients were observed; explanations for the uniform distribution of disease were (a) extensive spread prior to the period of assessment, (b) no physical barrier to dispersal due to the juvenile growth stage of the crop and (c) exhaustion of the point‐source.