What is powdery mildew?

This spring and early summer we encountered unseasonably cold and wet weather conditions which created a perfect environment for fungal diseases. Powdery mildew is one of the most common fungi that can affect just about any plant. It is easily recognized by its powder-like appearance on the leaves and stems of plants. The good news is, it is rarely fatal for the plant however, it can cause a great deal of stress that may result in yellowing of the leaves, dried brown leaves, and disfigured shoots and flowers. Young foliage are particularly susceptible

How did I get powdery mildew? 

Powdery mildew can be overwintered in plant debris and in the spring begin producing spores. The spores are then dispersed by wind, insects or splashing water. The condition that encourage the growth and spread of powdery mildew are dampness, high humidity, moderate temperatures (60 to 80 degrees F) and poor air circulation between plants.

How can I control powdery mildew?

One way to control powdery mildew is to water your plants in the morning, this gives the plants enough time to dry off during the day. Also, make sure to water at the roots to avoid getting the foliage too wet. Another way is to create air flow between your plants by thinning them out or pruning. Fungicides can also aid in preventing and controlling powdery mildew. Be sure to check the label if you are choosing to use on edibles. Some of the ingredients to look for in a fungicide are: potassium bicarbonate, neem oil, sulfur or copper.

At Caan’s we have a great variety of products that can help with fungal issues don’t hesitate to stop in and ask for assistance!


“A weed is but an unloved flower.”

-Ella Wheeler Wilcox