Apples, Podosphaera leucotricha
First Page Number
Powdery mildew (Podosphaera leucotricha) markedly affects the growth and vigour of susceptible apple varieties, particularly Jonathan and Cleopatra.
The fungus survives the winter as mycelial threads in dormant buds on spurs and laterals infected the previous season. At bud-burst the mycelium grows onto the developing leaves and blossom clusters to form white patches.
Spores produced on these patches are spread by the wind onto the healthy growth.
Department of Agriculture, Western Australia
"Powdery mildew of apples,"
Journal of the Department of Agriculture, Western Australia, Series 4: Vol. 12:
6, Article 32.
Available at: https://library.dpird.wa.gov.au/journal_agriculture4/vol12/iss6/32