Synonyms: Alphitomorpha labiatarum, Arthrocladiella althaeae, Arthrocladiella altheae, Erysiphe communis, Erysiphe galeopsidis, Erysiphe labiatarum, Erysiphe lamii, Golovinomyces galeopsidis.
Common names: powdery mint mildew, Labiate Powdery Mildew.
Neoerysiphe galeopsidis is a powdery mildew fungus that infects plants in the family Lamiaceae, particularly species of Galeopsis and related genera. In East and Central Texas, it has been found on Phlomis lanata, Physostegia virginiana, and Salvia farinacea, among other hosts. The fungus produces white, powdery conidial colonies on leaf surfaces, and its teleomorph stage forms black, percurrent cleistothecia containing asci with ascospores.
Powdery mint mildew caused by fungus Neoerysiphe galeopsidis on henbit leaves near a pond in Washington-on-the-Brazos State Historic Site. Washington, Texas, April 21, 2018
Powdery mint mildew caused by fungus Neoerysiphe galeopsidis on henbit leaves in TAMU Holistic Garden in Texas A and M University. College Station, Texas, March 27, 2021
Clasping henbit (henbit deadnettle, Lamium amplexicaule) with powdery mint mildew caused by fungus Neoerysiphe galeopsidis in TAMU Holistic Garden in Texas A and M University. College Station, Texas, March 27, 2021
Powdery mint mildew caused by fungus Neoerysiphe galeopsidis on clasping henbit (Lamium amplexicaule) in TAMU Holistic Garden in Texas A and M University. College Station, Texas, March 27, 2021
Conidia of powdery mint mildew caused by fungus Neoerysiphe galeopsidis under microscope, from clasping henbit (henbit deadnettle, Lamium amplexicaule) collected in Bee Creek Park. College Station, Texas, March 25, 2022
Conidia of powdery mint mildew caused by fungus Neoerysiphe galeopsidis under microscope in iodine solution, from clasping henbit (henbit deadnettle, Lamium amplexicaule) collected in Bee Creek Park. College Station, Texas, March 25, 2022The fungus Neoerysiphe galeopsidis was observed causing powdery mint mildew on henbit leaves in various locations in East and Central Texas. In Washington, Texas, the fungus was found on henbit leaves near a pond in April 2018. At Texas A&M University, the fungus was observed on henbit leaves in the TAMU Holistic Garden in March 2021, with multiple instances of infection on clasping henbit (Lamium amplexicaule). Microscopic examination of conidia from infected clasping henbit collected in Bee Creek Park, College Station, revealed characteristic features of the fungus. The conidia were also examined in iodine solution, providing further confirmation of the identity of the fungus. These observations suggest that Neoerysiphe galeopsidis is present and active in East and Central Texas, infecting henbit and related species. The fungus was found in different locations and times, indicating its widespread presence.
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