Podosphaera leucotricha

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Podosphaera leucotricha symptoms on 'Gala' apple shoots (click on image to enlarge it)
Author(s): Stefano Pessina, Dario Angeli, Stefan Martens, Richard G.F. Visser, Yuling Bai, Francesco Salamini, Riccardo Velasco, Henk J. Schouten and Mickael Malnoy
Source: Plant Biotechnology Journal, 2016, vol. 14 p. 2036

Podosphaera leucotricha (Ell. & Everh.) E. Salmon - (apple powdery mildew)

The fungus is widespread and infects apple (powdery mildew), peach (rusty spot) and other crops. Young leaves are most susceptible and develop white patches on the upper surfaces with corresponding chlorotic patches on the lower surfaces. Infected leaves often curl and crinkle and drop prematurely. On apple, the fungus overwinters in the buds and quickly spreads in spring to the newly formed leaves and flowers. Secondary infections follow through wind-borne conidia and fruits can also become infected. The conidia do not need free moisture for germination. The infections weaken the tree and yield and fruit quality is reduced.

Vernacular names
• Deutsch: Apfelmehltau
• English: apple powdery mildew
peach rusty spot
• Español: mal blanco del manzano
• Français: blanc du pommier

Conidia are formed in chains on the plant surface and have a size of around 25-35 x 12 µm. In autumn tiny sexual fruiting bodies (chasmothecia or ascocarps) are formed. These serve as overwintering structures and do not germinate readily. They measure around 80-90 µm in diameter and each contains a single ascus with 8 ascospores. The ascospores are elliptical and about 22-36 x 12-15 µm in size.