Rose powdery mildew (Sphaerotheca pannosa) The symptoms appear mainly on the younger shoots. The leaves become distorted and puckered, and buds fail to open. A greyish, powdery deposit appears on the ...

SINCE 1914 the chemical and mycological departments of Wye College have collaborated in testing the fungicidal properties of spray fluids, especially those containing sulphur. In this work ...

If you have noticed a fine white substance on your roses, then they are likely suffering from powdery mildew. Learn how to treat and prevent this common issue.

The obligate biotrophic fungal species Podosphaera xanthii [syn. Sphaerotheca fuliginea (Schlecht) Pollacci, syn P. fusca] and Golovinomyces cichoracearum (DC) V.P. Heluta (syn. Erysiphe cichoracearum ...