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Cercospora arachidicola (the anamorph stage) survives as stroma or mycelium in crop residue. Primary infection usually occurs after a period of rain, where the leaf is continually wet, and the pathogen thrives in areas of high relative humidity and moderate temperature (25-30 °C).
Lesions may enlarge and coalesce to kill the entire leaf. Symptoms are observed on all above-ground parts of the plant. [17] Lesions can be seen on the leaf collar, culm, culm nodes, and panicle neck node. Internodal infection of the culm occurs in a banded pattern. Nodal infection causes the culm to break at the infected node (rotten neck). [18]
Most bacteria associated with plants are saprotrophic and do no harm to the plant itself. However, a small number, around 100 known species, cause disease, especially in subtropical and tropical regions of the world. [15] [page needed] Most plant pathogenic bacteria are bacilli. Erwinia uses cell wall–degrading enzymes to cause soft rot.
Sclerotinia sclerotiorum is a plant pathogenic fungus and can cause a disease called white mold if conditions are conducive. S. sclerotiorum can also be known as cottony rot, watery soft rot, stem rot, drop, crown rot and blossom blight. A key characteristic of this pathogen is its ability to produce black resting structures known as sclerotia ...
Causally known as Sclerotial blight, [4] Agroathelia rolfsii survives in the soil as sclerotia, and in infected decomposing plant material as mycelia. [5] Collar rot that is caused by the oomycete Phytophthora is causally called Phytophthora collar rot, and is a common disease of fruit and nut trees, [5] [6] as well as other flowers [7] and crops.
The biofilm found on drains and faucets is a breeding ground for microbes that can cause pneumonia and Legionnaires’ disease, researchers found. Your sink is a breeding ground for bacteria that ...
Many phytoplasma-infected plants develop a bushy or "witches' broom" appearance due to changes in their normal growth patterns. Most plants exhibit apical dominance, but infection can trigger the proliferation of axillary (side) shoots and a reduction in internode size. [8] Such symptoms are actually useful in the commercial production of ...
An invading horde of giant African land snails has forced a county in southern Florida to introduce a quarantine zone in the hope of stopping the marauding molluscs before they can lay waste to ...