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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]
Peronospora destructor is a plant pathogen. It causes downy mildew on leaves of cultivated and wild Allium. Allium cepa (onion and shallot) is most often affected, while Allium schoenoprasum (chives) and Allium porrum (leek) are only occasionally affected. Downy mildew is a major disease of onion. [1]
Plasmopara halstedii is a plant pathogen infecting sunflowers. 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 ...
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]
Peronospora is a genus of oomycetes that are obligate plant pathogens of many eudicots. [1] Most species in this group produce a downy mildew disease, which can cause severe damage to many different cultivated crops, as well as wild and ornamental plants. [2]
Downy mildew has more direct importance on spinach (Spinacia oleracea), [4] since it affects the harvested part (leaves). Yellow lesions appear on the older leaves. If rotating crops and removing individual infected plants fails, fungicide treatments are effective, and resistant cultivars are available.
If you must bring outdoor plants inside for the cold weather months, spray them down with a hose first, then proactively treat with an insecticidal soap. Or consider using a systemic insecticide ...
Peronospora manshurica is a plant pathogen. It is a widespread disease on the leaves of soybeans [1] and other crop plants. The fungi is commonly referred to as downy mildew, "leafspot", or "leaf-spot".