Coleosporium asterum
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Author: Robert L. Anderson, USDA Forest Service
Source: IPM Images
Author: László Érsek
Source: Plant Parasites of Europe
Coleosporium asterum (Dietel) Syd. & P. Syd. 1914 - (pine needle rust)
This rust fungus has been reported from North America, as well as from parts of Europe and eastern Asia. It is regarded as a quarantine risk in some countries (Marinova-Todorova et al., 2020). On young pine trees, it causes discoloration of the needles and in severe cases, needles die and fall off, reducing the growth of the tree. Older trees are little affected. It also causes a rust disease on the alternate host, ornamental and other species of Aster.
Basidiospores of Coleosporium asterum infect pine trees in late summer or autumn. These form aecia in spring with the aeciospores infecting an alternate host of the genus Aster, where they propagate asexually forming urediniospores and finally teliospores which infect pine trees again. There are several other species of Coleosporium which also cause "pine needle rust", but have different alternate hosts. Among these is Coleosporium solidaginis which has Solidago canadensis as alternate host and has been often confused with Coleosporium asterum (USDA Fungal Databases)
Synonyms:
Stichopsora asterum
