Ascochyta tarda
species of fungus
Ascochyta tarda or Phoma tarda is a fungal plant pathogen that causes dieback and leafspot on coffee and was first observed in Ethiopia in 1954 (Stewart, 1957). It poses a potentially serious threat to coffee crops, but climate change may reduce the prevalence of environmental conditions favorable to its spread.
Importance
Die-back is a condition in which a tree or shrub begins to die from the tip of its leaves or roots backwards, owing to disease or an unfavorable environment). Necrosis of both flowers and rosettes is also observed with this pathogen and this can significantly reduce crop yield. Researchers once thought that the pathogen would not be able to infect in regions such as north of the Minas Gerais state and northeast of the Brazilian states, but the prevalence of this disease has then since been reported many times (De C. Alves, M., de Carvalho, L.G., Pozza, E.A., Sanches, L., de S. Maia. J.C., 2011). While Ascochyta tarda does not usually present as an epidemic, it can explode as such if the environmental conditions create enough damage on the leaf for the pathogen to have opportunities to enter the leaf tissue. Cold climate, heavy rain, strong wind, and hail are all aggressive weather conditions that increase probability of infection. The optimal temperature for production of conidia, germination of conidia and growth of mycelia is 25 C for this pathogen. (Lorenzetti, E.R., Pozza, E.A., de Souza, P.E., 2014).
The public source identifies “Ascochyta tarda” as species of fungus. This brief keeps that definition visible, then builds a research path around Ascochyta, tarda and species.
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A short description can identify a subject without explaining its stakes. For “Ascochyta tarda”, the useful work is to connect “species of fungus” to the records capable of establishing context and consequence.
Stable identifiers, scientific names and standards terminology offer the best bridge between this overview and specialist evidence. The source revision retrieved here is dated May 28, 2025. The linked authority identifier is Q4803972. None of the 0 selected statements returned an explicit reference. The first chronological checks are 1954, 1957, 2011 and 2014.
Current terminology should not be projected backward without checking the classification used when the underlying evidence was created. The source lead contains qualifying language; that uncertainty should survive quotation, summary and reuse. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
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This entry incorporates text from “Ascochyta tarda” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.