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| - Pyrenochaeta terrestris är en svampart som först beskrevs av H.N. Hansen, och fick sitt nu gällande namn av Gorenz, J.C. Walker & Larson 1948. Pyrenochaeta terrestris ingår i släktet Pyrenochaeta, ordningen Pleosporales, klassen Dothideomycetes, divisionen sporsäcksvampar och riket svampar. Inga underarter finns listade i Catalogue of Life. (sv)
- Pyrenochaeta terrestris is a fungal plant pathogen infecting maize, sweet potatoes and strawberries. This plant pathogen causes a disease in onion (Allium cepa) that is commonly called Pink Root. This fungus is also known to infect shallot, garlic, leek and chive, cantaloupe, carrot, cauliflower, corn, cowpea, cucumber, eggplant, lima bean, millet, vats, peas, peppers, potato, spinach, sugarcane and tomato. Host Range and Distribution Disease Cycle and Epidemiology (en)
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has abstract
| - Pyrenochaeta terrestris is a fungal plant pathogen infecting maize, sweet potatoes and strawberries. This plant pathogen causes a disease in onion (Allium cepa) that is commonly called Pink Root. This fungus is also known to infect shallot, garlic, leek and chive, cantaloupe, carrot, cauliflower, corn, cowpea, cucumber, eggplant, lima bean, millet, vats, peas, peppers, potato, spinach, sugarcane and tomato. This fungus produces dark brown to black pycnidia that have setae with one to five septa and are 8-120 µm long. Setae mostly occur around the ostiole, but may grow anywhere on the pycnidium. Pycnidiospores are hyaline, oblong - ovoid, biguttulate, and sessile in the pycnidium and ooze from ruptures or through the ostiole. The mycelium formed bythis fungus is septate, branching, and hyaline. If this fungus is grown on wheat straw or cellulose it produces a pink pigment that is a prominent characteristic of the disease this pathogen causes. This pathogen also produces several toxins. Host Range and Distribution Pyrenochaeta terrestris has been documented as a widespread saprophyte and a weak parasite to a lot of hosts. The biggest losses caused by this disease are usually from a disease complex including the species Fusarium, Pithium, Rhizoctonia and Helminthosporium. "In 1941 it was reported to survive on soybean, pea, cane, millet, oats, barley, wheat, corn, squash, cucumber, cantaloupe, muskmelon, tomato, pepper eggplant, cauliflower, carrot, spinach, and onion with reports of high disease to no disease damage". This pathogen is adapted to many climates such as temperate, sub-temperate, and tropical; due to its ability to survive in a broad range of pH, temperatures, and soil types. Disease Cycle and Epidemiology This pathogen can survive as deep as 45 cm in the soil. It will survive in the soil as a type of spore, pycnidia, in plant roots, or plant debris of susceptible disease. Seed can not be infected. The root tips of onions are penetrated directly by hyphae. Colonies of the fungus will grow on the root or a few centimeter away from the root tip. The fungus will extend throughout the root system, but the pathogen does not infect the basal stem plate or scales of the bulb. Ideal soil temperature for this pathogen and development of the disease is 24-28 degrees Celsius. Yield losses are greatest when plants are infected early in the season resulting in a poor root system that cannot keep up with water uptake during hot temperatures. (en)
- Pyrenochaeta terrestris är en svampart som först beskrevs av H.N. Hansen, och fick sitt nu gällande namn av Gorenz, J.C. Walker & Larson 1948. Pyrenochaeta terrestris ingår i släktet Pyrenochaeta, ordningen Pleosporales, klassen Dothideomycetes, divisionen sporsäcksvampar och riket svampar. Inga underarter finns listade i Catalogue of Life. (sv)
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