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Peronosclerospora philippinensis, commonly known as Philippine downy mildew, is a species of mildew of the fungal-like protist class Oomycetes. It is related to Phytophthora infestans , which caused the potato blight that led to the Great Irish famine .
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 ...
Mildew is a form of fungus. It is distinguished from its closely related counterpart, mold , largely by its colour: molds appear in shades of black, blue, red, and green, whereas mildew is white. It appears as a thin, superficial growth consisting of minute hyphae ( fungal filaments) produced especially on living plants or organic matter such ...
Peronospora belbahrii, common name basil downy mildew, is a pathogenic water mold that affects basil species. Rapidly spread by windborn spores, the pathogen was first discovered in Italy in 2003. [1] In 2007 it was detected in Florida and by 2008 had already spread to outdoor and greenhouse basil crops in the United States and Canada. [2]
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 causes downy mildew on a vast number of cereal crops including oats, rice, maize, and wheat as well as varieties of turf grass. [1] The common names of the diseases associated with Sclerophthora macrospora include "crazy top disease" on maize [ 2 ] and yellow tuft disease on turf grass. [ 3 ]
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.
A 2016 study showed that infected plants did not exhibit decreased numbers of soybean pods or grains per pod, however seed weight decreased linearly with increasing downy mildew severity. [3] It has also been shown to cause 9-18% yield losses during epidemics. [ 7 ]
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