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People can observe P. infestans produce dark green, then brown then black spots on the surface of potato leaves and stems, often near the tips or edges, where water or dew collects. [9] The sporangia and sporangiophores appear white on the lower surface of the foliage. As for tuber blight, the white mycelium often shows on the tubers' surface. [10]
'Vitelotte' potatoes have a dark blue, almost black, skin and dark violet-blue flesh; they have a characteristic nutty flavour and smell of chestnuts. The colour is retained in cooking, and is due to natural pigments in the anthocyanin group of flavonoids. [4] The plants mature late and, compared to modern varieties, are relatively low-yielding.
The plant grows to a height of about 2.5 feet (0.76 m), [4] and is shallow-rooted and thus suitable for container growing. The potato is suitable for roasting, baking or steaming, and is commonly fried into chips or crisps. [3] The potato is fairly small compared with modern cultivars, and when sliced has a purple ring near the edge. [5]
However, Rizzo notes, purple potatoes can be harder to find and a little more expensive than other potato varieties. And, all that said, it's a "huge misconception" that sweet potatoes are vastly ...
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This variety is a mutation (or sport) of the cultivar 'Burbank's Seedling' that was selected by the plant breeder Luther Burbank in 1873. The known lineage of Russet Burbank began in 1853 when Chauncey E. Goodrich imported the Rough Purple Chili from South America in an attempt to add diversity to American potato stocks which were susceptible to late blight.
In plant pathology, "mosaic" is a symptom, characteristic of many viruses, in which diseased leaves show undefined dark green sectors alternating with lighter colored sectors, ranging from light green to yellow. Potato leaf mosaic symptoms can be caused by different viruses individually or in combination.
The 'Adirondack Blue' is a potato variety with blue flesh and skin with a slight purple tint, released by Cornell University potato breeders Robert Plaisted, Ken Paddock, and Walter De Jong in 2003. The 'Adirondack' varieties are purple and the skin may be slightly netted. Tuber dormancy is short.