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Common scab is a plant disease of root and tuber crops caused by a small number of Streptomyces species, specifically S. scabies, S. acidiscabies, S. turgidiscabies and others. Common scab mainly affects potato ( Solanum tuberosum ), but can also cause disease on radish ( Raphanus sativus ), parsnip ( Pastinaca sativa ), beet ( Beta vulgaris ...
The mites burrow into the skin to live and deposit eggs. [3] The symptoms of scabies are due to an allergic reaction to the mites. [2] Often, only between 10 and 15 mites are involved in an infection. [2] Scabies most often spreads during a relatively long period of direct skin contact with an infected person (at least 10 minutes) such as that ...
A potato infected by common scab. Streptomyces scabiei is a streptomycete bacteria which means it forms a mycelium made of hyphae, a growth form more usually associated with fungi. The hyphae of Streptomyces, are much smaller than those of fungi (0.5–2.0 μm) and form a heavily branched mycelium.
Sarcoptes is a genus of skin parasites, and part of the larger family of mites collectively known as "scab mites". They are also related to the scab mite Psoroptes, also a mite that infests the skin of domestic animals. Sarcoptic mange affects domestic animals and similar infestations in domestic fowls cause the disease known as "scaly leg".
Pecan scab is the most economically significant disease of pecan trees (Carya illinoinensis) in the southeastern United States. [1] Venturia effusa is a fungal plant pathogen that causes pecan scab. The fungus causes lesions and tissue death on pecan twigs, petioles, leaves, nuts and shucks beginning in early spring, with multiple cycles of ...
Pear scab, a pear fungal disease caused by Venturia pirina or Fusicladium pyrorum; Poinsettia scab, a spot anthracnose disease caused by Sphaceloma poinsettiae; Powdery scab, a disease of the skin of potatoes caused by the protozoa Spongospora subterranea; Sheep scab, a skin disease of sheep caused by the mite Psoroptes ovis
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The texture of the scabs are rough and cracked which is in contrast to the smooth and shiny avocado skin. The dramatic differences in color and texture make it easy to identify the scabs on host trees. Procession of the infection leads to fusion of the discrete scabs to form larger rutted patches.