Powdery Mildew: What You Need to Know About this Pervasive Tree Disease

Powdery Mildew: What You Need to Know

Trees are susceptible to disease just like people. One prevalent disease is powdery mildew. Here’s some important information about this fungal infection and how it can ravage trees and shrubs. Prevention is possible with proper tree care.

What Is Powdery Mildew?

Powdery mildew is a disease that causes white splotches to appear on leaf and stem surfaces. The splotches resemble white powder, hence the name. The disease thrives in high-humidity climates. While rarely fatal, powdery mildew can cause nutrients to leech from the surface of plant, leading to withering and discoloration. Tree removal due to powdery mildew is uncommon. However, the white powdery-like substance is a sign of ill health.

Fruit trees are especially vulnerable, as are flowers like roses, begonias, and chrysanthemums. 

Signs of Powdery Mildew

As mentioned, the most obvious sign is a powder-like substance. However, other signs may also manifest, such as:

  • Yellowish and brownish leaves
  • Shriveled leaves or leaf lesions
  • Leaves curling at the edges
  • Blistering on leaves and flowers or chlorotic spots
  • Fruits and flowers that appear malformed

How to Prevent Powdery Mildew

Use a fungicide spray. We suggest a solution consisting of sulfur, potassium bicarbonate, and neem oil. You should also remove all infected parts of the plant. Dispose of infected leaves accordingly and do not compost them.

Regular pruning is also necessary to prevent overcrowding. When portions of the plant/tree begin bunching up, it reduces air circulation and increases humidity. Another little-known solution is milk. most people aren’t aware that milk has anti-fungal properties. Spray milk on the infected areas to kill the fungi and spores.

We Cure and Prevent Powdery Mildew

Signs of powdery mildew do not require immediate emergency service. However, we do recommend professional attention. Call Pro-Cut Tree Service if you spot signs of this fungal disease. Powdery mildew is a common disease that can gradually decrease tree health.

Tree Disease Prevention

Serving customers in Lake Stevens, Edmonds, Marysville, Mukilteo, Lynnwood, Everett, Snohomish and the surrounding area