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Leveillula taurica
''Leveillula taurica'' is an obligate fungal pathogen, from the phylum ''Ascomycota'', which causes powdery mildew on onion. This disease prefers warm, dry environments. It is rare in the United States, and is currently restricted to western states. Globally, it is also a minor problem with limited occurrences in the Middle East, Europe, and South America. ''L. taurica'' causes powdery mildew of onions, but is also known to infect other allium, solanaceous, and cucurbit species. The disease has appeared in parts of the Middle East, the Mediterranean, and South and North America. Currently, it is not a cause for major concern in the U.S. and throughout the world, as its geographic extent is sparse. In addition, it is relatively easy to control through basic sanitation and reducing water stress.
== Hosts and Symptoms ==
''L. taurica'' is the pathogen responsible for powdery mildew on onions, but it can also infect peppers, tomatoes, eggplant, cotton, and garlic. While ''L. taurica'' can infect many different plants it is actually very host specific. Different races of ''L. taurica'' can only infect certain crops, and even specific cultivars within the same crop. An accurate way to describe its host specificity is that this disease is, “a composite species consisting of many host-specific races."〔 Symptoms of Onion Powdery Mildew (OPM) are usually seen as circular or oblong lesions that are 5 to 20 mm and have a chlorotic or necrotic appearance.〔 The lesions appear on older leaves before the bulb of the onion begins to form, but also can occur on the younger leaves towards the end of the season.〔 As the disease progresses signs of OPM can also be seen. On the lesions white mycelium can be found with conidiophores bearing either lanceolate or rounded condia.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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