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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 are a particular problem for growers of crucifers , grapes and vegetables that grow on vines.
It is used in vineyards, fruit-farms, vegetable-farms and gardens to prevent infestations of downy mildew, powdery mildew and other fungi. It is sprayed on plants as a preventive treatment; its mode of action is ineffective after a fungus has become established. It was invented in the Bordeaux region of France in the late 19th century
The main method of identifying the disease is by the moldy, downy growth on the underside of leaves that appears white, gray, or light purple as this is a diagnostic sign of downy mildew of alfalfa [1] (Davis, Frate, and Putnam, 2017). Only seedlings and young tissue are susceptible to infection which, with proper cultural controls, can limit ...
Downy mildew is an extremely common disease of the lettuce plant. This is largely due to the disease's quick germination period—three hours—and the lettuce plant being susceptible at all growth stages. One study estimated that in untreated Florida fields 75% of lettuce was infected with downy mildew and considered unsalable. [113]
The species is one of many pathogens commonly referred to as downy mildew. [1] P. halstedii originated in North America. Plasmopara halstedii oospores produce a thin wall which are resistant structures, sexually produced that are essential for its continuation. After entering an area, the eradication of the pathogen is difficult due to the ...
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