09/Aug/2026, 4:42 PM
Tivoli elurajoon, Tallinn, Harju, Eesti
Urban area, Ribes alpinum shrubs, on affected leaves
59°26'34.9"N 24°46'50.5"E
🌡️ 22°C ⛅ Partly sunny 💨 Wind 240° WSW->ENE, 26 km/h
Original Instagram postPodosphaera mors-uvae
American Gooseberry Mildew
- Scientific identification
- Podosphaera mors-uvae (Schwein.) U. Braun & S. Takam.
- Family
- Erysiphaceae
- Class
- Leotiomycetes
- Genus
- Podosphaera
Names across languages
- English: American Gooseberry Mildew
- German: Amerikanischer Stachelbeer-Mehltau
- Finnish: herukanhärmä
- Estonian: Sõstra-jahukaste
- Russian: Подосфера мертво-ягодная
The scientific profile
From the latest record: 2026-08-09.
Hymenium
No exposed macroscopic hymenium; sexual spores develop within asci enclosed in globose chasmothecia, while the conspicuous white powdery coating consists mainly of superficial mycelium, conidiophores and chains of conidia
Body
White, flour-like superficial colonies on leaves, young shoots and fruits, initially patchy but often becoming confluent; ageing colonies turn greyish, brown to dark brown, with minute dark chasmothecia developing later in the season
Description
Spore mass white, powdery conidial mass; mature chasmothecia dark brown to black
Ecology
Obligate biotrophic parasite of Ribes species; infects leaves, young shoots and berries; conidia spread infections through the growing season while chasmothecia may overwinter and release ascospores in spring
Fruit body
Microscopic
Dimensions
Chasmothecia ∅ ~92–104 µm
Microscopy
Hyphae ~4–7 µm wide; conidiophores erect, cylindrical, ~92–165 × 9–11 µm; conidia produced in chains, broadly ellipsoid-ovoid to doliiform, ~22–31 × 14–22 µm, containing conspicuous fibrosin bodies; chasmothecia globose, ~92–104 µm, with few mycelioid appendages; each chasmothecium contains a single 8-spored ascus ~80–96 × 60–72 µm; ascospores ellipsoid-ovoid to subcylindrical, ~20–26 × 10–14 µm
Overview
Powdery mildew of gooseberries and currants
2000). Schlechtendalia 4: 30.
Field encounters
Source hashtags
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