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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.
Bordeaux mixture (also called Bordo Mix) is a mixture of copper(II) sulphate (CuSO 4) and quicklime (Ca O) used as a fungicide. 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 ...
Oxathiapiprolin (trade names Orondis, [1] Zorvec, and Segovis) is a fungicide.In the United States, the Environmental Protection Agency has approved it for use against several fungal diseases including downy mildew and various Phytophthora species [1] including late blight on crops including vegetables, ornamentals, and turf.
Because of numbers and results like these, downy mildew has been considered the most devastating disease of a filamentous pathogen to affect European vineyards. [ 3 ] [ 2 ] [ 7 ] When comparing three grape producers in Europe, including some fields that were treated with fungicides or other management strategies, the economic losses ranged from ...
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]
It causes downy mildew on leaves of carnation (Dianthus caryophyllus). [1] [2] The disease is of minor importance, whether in commercial production or gardens. If necessary, it can be controlled by foliar sprays of fungicides. [3]
Some downy mildew genera have a more restricted host range, e.g. Basidiophora, Paraperonospora, Protobremia and Bremia on Asteraceae; Perofascia and Hyaloperonospora almost only on Brassicaceae; Viennotia, Graminivora, Poakatesthia, Sclerospora and Peronosclerospora on Poaceae, and Plasmoverna on Ranunculaceae.
Dichlofluanid (N-dichlorofluoromethylthio-N ′, N ′-dimethyl-N-phenylsulfamide) is a fungicide used to protect strawberries, grapes, berries, apples, pears and other fruit, vegetables and ornamental plants from diseases such as apple scab (Venturia inaequalis), [2] black spot, leather rot, gray mold, downy mildew and others caused by the fungi Botrytis, Alternaria, Sclerotinia, and Monilinia.
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