Erysiphe syringae-japonicae
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Source: Plant Parasites of Europe
Erysiphe syringae-japonicae (U. Braun) U. Braun & S. Takam. 2000
This fungus infects lilac (Syringa) and Ligustrum, causing a powdery mildew disease. It is native to eastern Asia and has been reported from Europe since 1998, where it quickly spread and largely replaced Erysiphe syringae, another fungus causing powdery mildew on Syringa.
Symptoms include small white patches of mycelium on both sides of older leaves. Cleistothecia are brownish, with a diameter of 90–120 µm and equatorial appendages, up to 120 µm long. The apex of the appendages is 4–6 times dichotomously branched, with recurved tips. The cleistothecia contain 3 to 10 asci, which are sessile or short-stalked, 50–70 × 30–45 µm, usually with 7–8 spores. The ascospores are ellipsoid, hyaline and 19–21 × 9–10 µm large (M. Piatek, 2005).
