Synonyms: Albigo tomentosa, Botrytis euphorbiae, Erysiphe tomentosa, Ramularia euphorbiae, Sphaerotheca euphorbiae, Sphaerotheca tomentosa.
Podosphaera euphorbiae is a powdery mildew fungus that infects plants in the Euphorbiaceae family. In East and Central Texas, it has been found on various Euphorbia species, including Euphorbia heterophylla and Euphorbia marginata. The fungus forms white, powdery colonies on the surfaces of leaves, stems, and flowers, causing damage and reducing plant growth. It is commonly associated with warm and dry conditions, and its presence has been documented in several counties across the region, including Brazos, Grimes, and Williamson counties.
Reticulate-seeded spurge (Euphorbia spathulata) infected by white powdery mildew fungus Podosphaera euphorbiae on Raccoon Run Trail in Lick Creek Park. College Station, Texas, April 11, 2022
Warty spurge (Euphorbia spathulata) with white powdery mildew fungus Podosphaera euphorbiae on Raccoon Run Trail in Lick Creek Park. College Station, Texas, April 11, 2022
Tissues of white powdery mildew fungus Podosphaera euphorbiae under a microscope, collected on Raccoon Run Trail in Lick Creek Park. College Station, Texas, April 11, 2022
Conidia and cleistothecia, or ascomata (round) in iodine solution of white powdery mildew fungus Podosphaera euphorbiae collected on Raccoon Run Trail in Lick Creek Park. College Station, Texas, April 11, 2022
Conidia and cleistothecia, or ascomata (round) in iodine solution of white powdery mildew fungus Podosphaera euphorbiae collected on Raccoon Run Trail in Lick Creek Park. College Station, Texas, April 11, 2022
Conidia and cleistothecia, or ascomata (round) in KOH solution of white powdery mildew fungus Podosphaera euphorbiae collected on Raccoon Run Trail in Lick Creek Park. College Station, Texas, April 11, 2022
Spores of white powdery mildew fungus Podosphaera euphorbiae collected in Lick Creek Park. College Station, Texas, April 11, 2022
Various spores of white powdery mildew fungus Podosphaera euphorbiae collected in Lick Creek Park. College Station, Texas, April 11, 2022
Conidia chain and conidia with fibrosin bodies of white powdery mildew fungus Podosphaera euphorbiae collected in Lick Creek Park. College Station, Texas, April 11, 2022
Conidia of white powdery mildew fungus Podosphaera euphorbiae collected in Lick Creek Park. College Station, Texas, April 11, 2022
Spores of different types of white powdery mildew fungus Podosphaera euphorbiae collected in Lick Creek Park. College Station, Texas, April 11, 2022
Star-shaped structure insides white powdery mildew fungus Podosphaera euphorbiae collected in Lick Creek Park. College Station, Texas, April 11, 2022
Warty spurge (Euphorbia spathulata) with white powdery mildew fungus Podosphaera euphorbiae on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest north from Montgomery. Texas, April 16, 2022
Little Lake Creek Loop Trail, Montgomery County, Texas, 77873, United States
Reticulate-seeded spurge (Euphorbia spathulata) infected by white powdery mildew fungus Podosphaera euphorbiae on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest north from Montgomery. Texas, April 16, 2022Little Lake Creek Loop Trail, Montgomery County, Texas, 77873, United States
Warty spurge (Euphorbia spathulata) with white powdery mildew fungus Podosphaera euphorbiae or may be Oidium in Lick Creek Park. College Station, Texas, April 18, 2022Racoon Run Trail, College Station, Brazos County, Texas, United States
Warty spurge (Euphorbia spathulata) with white powdery mildew fungus Podosphaera euphorbiae or may be Oidium on Raccoon Run Trail in Lick Creek Park. College Station, Texas, April 18, 2022Racoon Run Trail, College Station, Brazos County, Texas, United StatesObservations of the fungus Podosphaera euphorbiae in East and Central Texas revealed its presence on various Euphorbia species, including reticulate-seeded spurge (Euphorbia spathulata) and warty spurge. The fungus was found to produce white powdery mildew on infected plants, with conidia and cleistothecia visible under a microscope in iodine or KOH solution. Spores of the fungus were collected and observed, showing varying shapes and structures, including chains and fibrosin bodies. The fungus was detected in multiple locations, including Lick Creek Park in College Station and Sam Houston National Forest north of Montgomery, on different dates in April 2022. In some cases, the identity of the fungus was uncertain, with possible confusion with Oidium. Overall, the observations suggest that Podosphaera euphorbiae is present and active in East and Central Texas, infecting Euphorbia species and producing characteristic white powdery mildew symptoms.
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