Powdery mildew

Page last edited 4,646 days ago
From WikiGardener
Jump to navigation Jump to search
Powdery mildew
Error creating thumbnail: Unable to save thumbnail to destination
Powdery mildew on a pumpkin leaf
Scientific Classification
Kingdom: Fungi
Division: Ascomycota
Class: Leotiomycetes
Order: Erysiphales

Powdery mildew is a fungal disease that affects a wide range of plants. Powdery mildew diseases are caused by many different species of fungi in the order Erysiphales.

Identifying Features[edit | edit source]

It is one of the easier diseases to spot, as its symptoms are quite distinctive. Infected plants display white powdery spots on the leaves and stems. The lower leaves are the most affected, but the mildew can appear on any above-ground part of the plant. As the disease progresses, the spots get larger and denser as large numbers of asexual spores are formed, and the mildew may spread up and down the length of the plant.

Treatment[edit | edit source]

As powdery mildew does not like wet conditions, wetting the leaves reduces the severity of attack. A "wetter", e.g. detergent, has to be added (just a squirt); plain water will just run off the leaves. Weeds can over-winter the fungus, so good garden hygiene is essential. Remove and bin or burn infected leaves, do not compost them.

Prevention[edit | edit source]

Ensure plants have adequate water, especially those in containers, and apply mulches over moist soil if grown in open soil. Avoid overcrowding plants to give good air circulation and minimise humidity. Don't feed plants too much nitrogen-rich fertiliser because this encourages lush sappy growth which is more susceptible to infection.[1]

Examples[edit | edit source]

Species[edit | edit source]

Erysiphe species[edit | edit source]

Leveillula species[edit | edit source]

Neoerysiphe species[edit | edit source]

Podosphaera species[edit | edit source]


References[edit | edit source]


This page uses Creative Commons Licensed content from Wikipedia (view authors).