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Rhytisma acerinum is a plant pathogen that commonly affects sycamores and maples in late summer and autumn, causing tar spot. Tar spot does not usually have an adverse effect on the trees' long-term health. [1] R. acerinum is an Ascomycete fungus that locally infects the leaves of trees and is a biotrophic parasite. [2]
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 ...
Clusia rosea is a tree native to the Caribbean, including the Bahamas, Hispaniola (such as in Los Haitises National Park), Cuba, Puerto Rico, and Florida. [7] [8]It is a hemiepiphyte; that is, it grows as an epiphyte on rocks or other trees at the start of its life and behaving like a strangler fig as it gets larger.
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]
Imperfect or irregular leaf endings commonly found on ferns and fossils of ferns from the Carboniferous Period. aphyllous Leafless; having no leaves. [20] apical At or on the apex of a structure, usually a shoot, a stem, or the trunk of a tree, e.g. an apical meristem or an apical bud. apiculate especially of leaves, ending in a short ...
The leaves are arranged in opposite decussate pairs or whorls of three; in adulthood they are scale-like, 1–2.5 mm (1 ⁄ 16 – 1 ⁄ 8 in) long (up to 5 mm) and 1–1.5 mm broad. The cones are berrylike , 7–15 mm ( 1 ⁄ 4 – 9 ⁄ 16 in) wide, green when young and maturing to orange-brown with a whitish waxy bloom,.
The black spots can become about 5 millimeters in diameter. [1] As the season continues, the tissue around the original spot may become necrotic. [4] In severe cases of the disease there is premature shedding of leaves, blight of young leaves and shoots, and complete defoliation early in the fall. [1] Fruits that are infected become crumpled. [1]
Artocarpus hirsutus grows as a canopy tree and can reach a height of up to 35 metres (115 ft) and about 4.5 m (15 ft) in girth. [5] The leaves of this tree are simple and phyllotaxy is alternate. The shape can be described as elliptic or ovate with 10–25 cm (4–10 in) × 5–14 cm (2–6 in) size. When it is young it is densely hirsute beneath.