Spore of powdery mildew plant, Erisyphe

Spore of powdery mildew plant, Erisyphe

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Caption: Scanning electron micrograph of a pathogenic fungus Erisyphe pisi also known as E. polygoni, cause of powdery mildew on grasses including cereals, clover, & peas. Economically disastrous, the infection begins with a conidium (spore, seen here) germinating a short germ tube (right), which attaches to the leaf surface (pea here) with a pad or appressorium (tip). A tube grows from under the pad into the epidermis. If the plant is susceptible the tube produces outgrowths in the cell called haustoria (food gatherers). The threadlike mycelium, a network of hyphae, which then covers the leaf surface has not yet begun to grow. Mag: X2000 (10x8 size).

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

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