False-colour SEM of Erisyphe pisi fungus

False-colour SEM of Erisyphe pisi fungus

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Caption: False-colour scanning electron micrograph of the pathogenic fungus Erisyphe pisi (red), also known as E. polygoni, cause of powdery mildew on grasses including cereals, clover, & peas. Economically disastrous, the infection begins with spores, or conidia, germinating a short germ tube. The tube attaches itself to the leaf surface (in this case of a pea) with a pad or appressorium. Another tube grows from under the pad into the epidermis. If the plant is susceptible, the tube produces out- growths in the cell. A thread-like mycelium covers the leaf surface (as here), producing conidioph- ores which bear the conidia. Magnificatin: x45 at 35mm size, x75 t 6x4.5cm size. Full-colour version: red mycelium on green leaf.

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Keywords: conidiophore, conidium, disease, erisyphe pisi, erisyphe polygoni, eumycota, false-coloured, fungal, fungi, fungus, mycelium, mycology, nature, naturemycology, plant, powdery mildew, scanning electron micrograph, sem

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