Podosphaera xanthii
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Author: Paul Bachi, University of Kentucky Research and Education Center
Source: IPM Images
Podosphaera xanthii (Castagne 1845) U. Braun & Shishkoff 2000
The fungus causes a serious and wide-spread powdery mildew disease on cucurbits. The fungus also infects sunflower, ornamentals and some other crops. The infected plants show whitish, powdery spots on both sides of the leaves, resulting in chlorosis. The older leaves are attacked first. Fungicides, resistant cultivars and crop rotation are used as as management options.
Conidia develop in chains, are ellipsoid, with crenate (notched) edges and about 30 x 20 µm large. Ascospores are around 20 x 12-15 µm.
This fungus was previously often referred to as Sphaerotheca fuliginea (= Alphitomorpha fuliginea). See also Erysiphe cichoracearum which causes a similar disease on cucurbits.
| Vernacular names | |
|---|---|
| • Deutsch: | Echter Gurkenmehltau Mehltau der Kürbisgewächse |
| • English: | cucurbit powdery mildew zucchini squash powdery mildew cucumber powdery mildew powdery mildew of zucchini squash jujube powdery mildew powdery mildew of cucumber |
| • Español: | oídio de las cucurbitáceas |
| • Français: | blanc du concombre oïdium des cucurbitacées |
Synonyms:
Erysiphe xanthii
Sphaerotheca cucurbitae
- Other images of Podosphaera xanthii (IPM Images - click to enlarge)
spore-producing bodies (conidiophores) and chains of asexual spores (conida) on Cucurbita
spore-producing bodies (conidiophores) and chains of asexual spores (conida) on Cucurbita
conidia
conidiophores and conidia
