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Schamberg's disease, (also known as "progressive pigmentary dermatosis of Schamberg", [1] "purpura pigmentosa progressiva" (PPP), [1] and "Schamberg's purpura" [1]) is a chronic discoloration of the skin found in people of all ages, usually only affecting the feet, legs or thighs or a combination.
Rust fungi grow intracellularly, and make spore-producing fruiting bodies within or, more often, on the surfaces of affected plant parts. [3] Some rust species form perennial systemic infections that may cause plant deformities such as growth retardation, witch's broom, stem canker, galls, or hypertrophy of affected plant parts.
The most identifiable sign of P. helianthi is the uredinia which forms rust-colored pustules on leaves, stems, petioles, and bracts. These darken into black, telial resting pustules once temperatures decrease. Flask-shaped pycnia appear as yellow-orange spots, 6mm or less, on the upper side of leaves in early spring.
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Two members of a Cybertruck owner's forum report orange spots on their brand-new trucks. Rain may be to blame. Some Cybertruck Owners Are Already Reporting Rust Spots
Rust lesions can cause leaves or stems to become weak and break or fall off, resulting in decreased photosynthetic ability and extreme difficulty during harvest. Symptoms on the alternate host grasses are small ovular red/brown (rust colored) powdery lesions, which release uredospores .
Puccinia asparagi is the causative agent of asparagus rust.It is an autoecious fungus, meaning that all stages of its life cycle – pycniospores, aeciospores, and teliospores – all develop upon the same host plant [1] [2] [3]. [4]
The color of the urediniospore can range from a golden to a yellow-orange, and are egg or pear shaped. [4] The uredospores are responsible for the spread of the rust to new leaf tissue. Uredospores are subglobose to ovoid or pyriform, echinulate, and measure 25.74 to 37.18 x 17.16 to 27.17 μm, with thickened walls apical walls (1.3 to 1.6 μm ...
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