This fungus disease occurs all over the North America and infects a wide variety of plants, including beans, cucurbits, lettuce, and peas. A powdery white growth covers the upper surface of leaves, which eventually turn yellow and dry. Older leaves are usually infected first. The fungus competes with the plant for nutrients, reducing yields and weakening or even possibly killing it if infection is severe. Fruits and pods may also be covered with mildew. This disease usually develops late in the season on mature plants and thrives in both dry and humid weather. It can spread rapidly.
Preventing powdery mildew is crucial for maintaining healthy vegetables and reducing the need for treatments later. Here are some preventive measures:
Organic Controls
If prevention measures fall short and you notice signs of powdery mildew, here are some organic treatment options:
Conventional Controls
If organic controls do not effectively manage the powdery mildew problem, you may consider conventional fungicides as a last resort. Here are some options:
Always follow the label instructions carefully when using any fungicides, whether organic or conventional. Rotate between different fungicides to prevent resistance development in the powdery mildew population.
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