Downy mildew
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Downy mildew refers to any of several types of oomycete microbes that are obligate parasites of plants. Downy mildews exclusively belong to the Peronosporaceae family. In commercial agriculture, they
Example of downy mildew (left) along with powdery mildew on a grape leaf
Conidiophores of Peronospora variabilis on the underside of a leaf of Chenopodium album.
Flowerheads of Succisa pratensis, infected (right) and uninfected (left) with the floricolous downy mildew Peronospora violacea.
Common sunflower
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The common sunflower is a large annual forb in the daisy family Asteraceae. The domesticated form of common sunflower is harvested for its edible seeds, which come in two types: oil and confectionary
Downy mildew
…effusa, an oomycete pathogen that poses a challenge to spinach production worldwide, especially in organic production. Plasmopara halstedii infects sunflowers, producing oospores which can remain dormant in the soil for many years. Blue mold (of tobacco plants…
Sunflower sky backdrop
Flower heads facing east, away from the late afternoon sun
Detail of disk florets
A head of a sunflower