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Once on the leaves, the spores germinate and penetrate through the stoma. [2] The subsequent infection causes chlorosis of the leaves in localized yellow spots. As the season continues into summer, apothecia begin to form, giving rise to brown-black leaf lesions that resemble spots of tar. [2] Leaves retain their yellow border from the initial ...
Cristulariella depraedans, commonly known as gray mold spot, sycamore leaf spot or bull's eye spot, is a fungal pathogen that affects maple trees (genus Acer) and certain other woody and herbaceous species. In maples, the foliage becomes affected by small grey lesions which expand and coalesce, the leaves later wilting and falling from the tree ...
†Acer castorrivularis Wolfe & Tanai (Late Eocene, Beaver Creek Flora) [2] Acer caudatifolium Hayata; Acer chienii Hu & Cheng †Acer clarnoense Wolfe & Tanai (Late Eocene, John Day Formation) [2] Acer crataegifolium Siebold & Zucc. Acer davidii Franch. †Acer dettermani Wolfe & Tanai (Late Eocene - Early Oligocene, Meshik Volcanics) [2] Acer ...
Acer negundo, also known as the box elder, boxelder maple, Manitoba maple or ash-leaved maple, is a species of maple native to North America from Canada to Honduras. [3] It is a fast-growing, short-lived tree with opposite, ash-like compound leaves.
Leaf spots can vary in size, shape, and color depending on the age and type of the cause or pathogen. Plants, shrubs and trees are weakened by the spots on the leaves as they reduce available foliar space for photosynthesis. Other forms of leaf spot diseases include leaf rust, downy mildew and blights. [4]
The leaves of the chalk maple are generally smaller, 5-8 cm across, with 3 to 5 lobes, whereas the leaves of the Florida maple are larger, up to 11 cm. The leaves of A. leucoderme are yellow-green underneath rather than the whitish underside of Florida maple. The lobes on the leaves of Florida maple are squarer and blunter than those of A ...
Acer pensylvanicam inflorescence in Ashford, Connecticut. Moosewood is an understory tree of cool, moist forests, often preferring slopes. It is among the most shade-tolerant of deciduous trees, capable of germinating and persisting for years as a small understory shrub, then growing rapidly to its full height when a gap opens up.
Acer campestre, known as the field maple, [2] is a flowering plant species in the family Sapindaceae. It is native to much of continental Europe , Britain, southwest Asia from Turkey to the Caucasus, and north Africa in the Atlas Mountains.