Powdery mildew. Coloured scanning electron micrograph of hyphae (green) and round cleistocarp 'fruiting bodies' (orange) of the powdery mildew Erysiphe galeopsidis. It is growing here on a red deadnettle plant. Hyphae are the tangled filaments which make up a fungal colony. The cleistocarps each contain several asci which are spore-bearing bodies. These asci produce asco-spores that are discharged into the air when the cleistocarp is ripe. Transported by wind, they settle and produce new fungal colonies. Powdery mildew is an agricultural pest; it parasitizes leaves of wheat and corn. Magnification: x170 at 5x7cm size. magnification: x580 at 8x10 inch size.

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