Powdery mildew. Coloured scanning electron micrograph (SEM) of the parasitic powdery mildew Erysiphe sp. on a leaf. Hyphae (dark green) are the tangled filaments growing across the leaf surface which form the fungal colony. Rising up from the hyphae are asexual spores called conidiophores (green & brown). Powdery mildew is so-called because of the numerous white spores it produces. It is an agricultural pest which parasitizes leaves of certain grass, cereal and vegetable plants. Magnification: x230 at 5x7cm size. x600 at 5x7ins print

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