Premium
Germination and growth of single‐pustule isolates of Erysiphe graminis tolerant and sensitive to tridemorph and ethirimol
Author(s) -
LAWS F. A.,
WALMSLEYWOODWARD DIANNE J.,
WHITTINGTON W. J.
Publication year - 1982
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.1744-7348.1982.tb01937.x
Subject(s) - germination , biology , fungicide , horticulture , virulence , inoculation , gene , biochemistry
SUMMARY The germination and colony growth of single‐pustule Erysiphe graminis isolates tolerant and sensitive to tridemorph and ethirimol was studied on glass slides and on leaf segments sprayed with tridemorph or left untreated. In the absence of the fungicide, neither tridemorph‐ nor ethirimol‐tolerant isolates differed from the sensitive in germination or colony growth. Germination percentages of all isolates were depressed by high temperature and low humidity, although some isolates grew well in less than optimum conditions. Differences between ethirimol‐ and tridemorph‐tolerant and sensitive isolates for colony size on untreated plants of various cultivars reflected differences in virulence to the host rather than fungicide tolerance. The presence of tridemorph retarded the growth rate of colonies of tolerant and sensitive isolates, but the germination of tridemorph‐tolerant isolates was greatly stimulated by low concentrations of tridemorph (50 mg/litre) and was less depressed than that of the sensitive isolates by high concentrations (200 mg/litre).