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Acer pycnanthum, the Japanese red maple, (ハナノキ, hananoki, or 花の木, hanakaede, meaning "flower maple") is a species of maple native to Japan, and introduced to Korea. [3] A tree usually about 20 m, reaching 30 m, it prefers to grow in relict mountain wetlands. It flowers in April, prior to the emergence of leaves. [4]
Phyllosticta minima is a fungus of the division Ascomycota which causes purple-bordered leaf spot, a largely cosmetic disease that infects maple trees. [1] It grows on living and fallen leaves, creating tan, ovular lesions 1 ⁄ 4 inch in diameter and ringed with 'purple' or black spores.
Acer palmatum, commonly known as Japanese maple, [3] palmate maple, [4] or smooth Japanese maple [5] (Korean: danpungnamu, 단풍나무, Japanese: irohamomiji, イロハモミジ, or momiji, (栴), is a species of woody plant native to Korea, Japan, China, eastern Mongolia, and southeast Russia. [6]
A slow-growing, dwarf Japanese maple, it features rich, red, heavily dissected leaves that turn more vibrant tones of red in fall. It only gets 2-3 feet tall, and 6-8 feet wide. Zones 4-9
The leaves are 10–15 cm long and 6–12 cm broad, with three or five lobes, the basal lobes of five-lobed leaves being small; they have a serrated margin, conspicuous veining, and a reddish 4–8 cm petiole. They are matt to sub-shiny green in summer, turning to bright yellow, orange or red in the autumn.
5. Low Humidity. Light brown spots scattered across fiddle leaf fig leaves can be caused by dry air. If the brown spots in question have a pox-like look instead of being in a single area of the ...
Sawadaea tulasnei is a fungus that causes powdery mildew on tree leaves. This fungus attacks the leaves of the Acer platanoides (Norway maple) in North America, Great Britain, and Ireland, Acer palmatum (also known as the Japanese maple or smooth Japanese maple). [34]
The lesions continue to grow, and by the end of summer form leaf spots that look like tar. [2] The spot can grow up to 1.5 inches (4 cm) in diameter. [4] A microscopic sign of the pathogen are the stroma, mats of hyphae found in the lesions. [2] These lesions can cause senescence of leaves but are mostly of cosmetic importance.