Green Algae
Green algae
17 host plants · Fungal
Last updated
A yellow-green powdery coating appears on holly trunks and twigs, starting on the north-facing side. Green algae grows in wet or humid conditions but doesn't harm the plant. Improve air circulation through adequate pruning and spacing. The algae is purely cosmetic; no intervention needed unless appearance matters.
Adequate pruning to permit good air circulation. Remove infected material promptly and improve growing conditions to limit pathogen spread. Good sanitation, adequate spacing, and proper irrigation practices reduce disease pressure over time.
Quick Reference
Agent Type
fungal
Causal Agent
Green algae
Host Plants
17
Management
Cultural Controls
- Adequate pruning to permit good air circulation.
Host Plants (17)
Atriplex hymenelytra Desert Holly Berberis aquifolium Oregon Grape, Oregon Grape Holly, Tall Oregon Grape Berberis pinnata California Barberry, California Holly Grape Grevillea aquifolium Holly, Grevillea Heteromeles arbutifolia Toyon Christmasberry California Holly Ilex aquifolium English Holly Ilex attenuata Ilex attenuata Ilex cornuta Chinese Holly, Horned Holly Ilex crenata Japanese Holly Ilex glabra Inkberry Inkberry Holly, Gallberry, Evergreen Winterberry Ilex latifolia Lusterleaf Holly Ilex meserveae Meserve Hybrid Holly Ilex paraguariensis Yerba Matá, Maté, Paraguay Tea Ilex verticillata Winterberrry Winterberry Holly, Michigan Holly, Christmas Berry Black Alder Olearia macrodonta Daisy, Bush, New Zealand Holly Osmanthus heterophyllus Holly Osmanthus Holly-leaf Osmanthus, Holly Tea Olive Quercus ilex Holly, Oak, Holm Oak
Sources & References
Data Maturity Baseline Extension data. Expert review underway.