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Alternaria brassicicola is a fungal necrotrophic plant pathogen that causes black spot disease on a wide range of hosts, particularly in the genus of Brassica, including a number of economically important crops such as cabbage, Chinese cabbage, cauliflower, oilseeds, broccoli and canola.
Alternaria leaf spot or Alternaria leaf blight are a group of fungal diseases in plants, that have a variety of hosts. [ 1 ] [ 2 ] [ 3 ] The diseases infects common garden plants, such as cabbage, and are caused by several closely related species of fungi. [ 4 ]
Alternaria brassicae is a plant pathogen able to infect most Brassica species including important crops such as broccoli, cabbage and oil seed rape. [2] [3] It causes damping off if infection occurs in younger plants and less severe leaf spot symptoms on infections of older plants. [2] [3]
In 2007, the cabbage crop in the US exceed $413M (1.4M+ tons). [18] Black rot is considered the most important disease of cabbage and other crucifers because Xcc infections may not become apparent until the warm summer months (well after planting), the pathogen spreads rapidly, and losses due to the disease may exceed 50% in warm, wet climates. [6]
A leaf spot is a limited, discoloured, diseased area of a leaf that is caused by fungal, bacterial or viral plant diseases, or by injuries from nematodes, insects, environmental factors, toxicity or herbicides. These discoloured spots or lesions often have a centre of necrosis (cell death). [1]
On the latter the black extends for a very short distance triangularly along the veins. There is a round black spot in interspace 3. The hindwing has a subcostal black spot as in Pieris rapae but is generally larger and more conspicuous, and a series of four or five terminal black spots that vary in size at the apices of the veins. [3]
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Napa cabbage is widely used in China, Japan, and Korea. [21] Napa cabbage is used as a sign of prosperity in China, [22] and often appears as a symbol in glass and porcelain figures. The Jadeite Cabbage sculpture of Taiwan's National Palace Museum is a carving of a napa cabbage variety. It is also found in North American and Australian cities ...