Umbellifer Powdery Mildew, Erysiphe heraclei, on Common Hogweed, Heracleum sphondylium, secondary host, Berkshire, England, September

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Keywords: berkshire, biological, contaminant, contaminating, control, disease, england, erysiphe, fungal, fungus, garden, heraclei, heracleum, hogweed, host, mildew, pathogen, plant, plants, powdery, secondary, september, sphondylium, uk, umbellifer, vegetables, wild