Synonyms: Botryosphaeria rosae, Caumadothis dothidea, Dothidea rosae, Sphaeria dothidea, Xyloma rosae.
Common name: Asteromyia gall midge fungus.
Extract from Wikipedia article: Botryosphaeria dothidea is a plant pathogen that causes the formation of cankers on a wide variety of tree and shrub species. It has been reported on several hundred plant hosts and on all continents except Antarctica. B. dothidea was redefined in 2004, and some reports of its host range from prior to that time likely include species that have since been placed in another genus. Even so, B. dothidea has since been identified on a number of woody plants—including grape, mango, olive, eucalyptus, maple, and oak, among others—and is still expected to have a broad geographical distribution. While it is best known as a pathogen, the species has also been identified as an endophyte, existing in association with plant tissues on which disease symptoms were not observed. It can colonize some fruits, in addition to woody tissues.
Botryosphaeria dothidea is a plant pathogenic fungus in the family Botryosphaeriaceae, order Dothideales, phylum Ascomycota. It is commonly found in East and Central Texas, where it infects a wide range of hosts, including trees, shrubs, and herbaceous plants. The fungus causes canker and dieback diseases, characterized by sunken lesions on stems, branches, and trunks, often accompanied by wilting or death of infected tissues. It produces pycnidia and perithecia as fruiting bodies, releasing conidia and ascospores for dispersal. In East and Central Texas, Botryosphaeria dothidea has been isolated from various native and non-native plant species, including oak, elm, and crape myrtle, with optimal growth temperatures between 20-30°C.
Flat-topped goldenrod (Euthamia leptocephala) with leaf tar spots caused by gall midge Asteromyia euthamiae with a symbiotic fungus Botryosphaeria dothidea in Lick Creek Park. College Station, Texas, June 1, 2022
Deer Run Trail, College Station, Brazos County, Texas, United States
Asteromyia gall midge fungus (Botryosphaeria dothidea) on leaves of flat-topped goldenrod (Euthamia leptocephala) in Lick Creek Park. College Station, Texas, June 1, 2022Deer Run Trail, College Station, Brazos County, Texas, United States
Tissues of Asteromyia gall midge fungus (Botryosphaeria dothidea) under a microscope, collected in Lick Creek Park. College Station, Texas, June 1, 2022
Leaves of goldenrod Solidago canadensis with raised white cushions caused by gall midges Asteromyia carbonifera and symbiotic fungus Botryosphaeria dothidea inside the galls on Richards Loop Trail in Sam Houston National Forest. Texas, July 10, 2022Little Lake Creek Loop Trail, Montgomery County, Texas, 77873, United States
Galls on leaves of goldenrod Solidago canadensis caused by gall midges Asteromyia carbonifera with symbiotic fungus Botryosphaeria dothidea on Richards Loop Trail in Sam Houston National Forest. Texas, July 10, 2022Little Lake Creek Loop Trail, Montgomery County, Texas, 77873, United States
Gall fungus Botryosphaeria dothidea (in Congo Red solution) collected from leaf tar spots on goldenrod on Richards Loop Trail in Sam Houston National Forest. Texas, July 10, 2022
Fungus Botryosphaeria dothidea (in Congo Red solution) collected from leaf tar spots on goldenrod on Richards Loop Trail in Sam Houston National Forest. Texas, July 10, 2022
Flat-topped goldenrod (Euthamia leptocephala) with leaf tar spots caused by gall midge Asteromyia euthamiae with a symbiotic fungus Botryosphaeria dothidea in Lick Creek Park. College Station, Texas, September 29, 2022Deer Run Trail, Pebble Creek, College Station, Brazos County, Texas, United StatesObservations of the fungus Botryosphaeria dothidea in East and Central Texas revealed its presence on various goldenrod species. In Lick Creek Park, College Station, the fungus was found on flat-topped goldenrod (Euthamia leptocephala) with leaf tar spots caused by gall midge Asteromyia euthamiae. Microscopic examination of tissues confirmed the presence of Botryosphaeria dothidea. Similarly, in Sam Houston National Forest, the fungus was observed on leaves of goldenrod Solidago canadensis with raised white cushions caused by gall midges Asteromyia carbonifera. The fungus was also collected from leaf tar spots on goldenrod and examined under a microscope using Congo Red solution. Repeat observations in Lick Creek Park in September 2022 again found the fungus on flat-topped goldenrod, confirming its persistent presence in the region. These findings highlight the symbiotic relationship between Botryosphaeria dothidea and gall midges on goldenrod species.
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