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Powdery Mildew Plant Disease

Powdery Mildew is a common and worldwide plant disease problem. Some plants are highly susceptible to Powdery Mildew. Other plants are completely immune to it. Powdery mildew is an airborne disease. It is also spread from plant to plant by insects. Keeping the insect population down will help the battle against this disease.

Powdery mildew arrives with a vengeance during hot, humid weather. It spreads and gets out of control rapidly. Effective treatment of this disease requires early identification and treatment. Affected leaves will not be cured of the ugly white spots. But, the disease can be stopped and killed.

Identifying Powdery Mildew:

This disease is easy to spot.  A white, powdery (some call it sugary),  substance begins to appear on the leaves of your plants. It spreads very quickly. Left untreated, the disease quickly covers the entire leave, killing leaf and plant.

Avoiding Powdery Mildew:

Powdery Mildew thrives in warm, humid, rainy weather. It likes dark and cloudy conditions. Poor air circulation, and moisture on the leaves helps the rapid growth of the disease.

You can't change the weather. But, there are a couple things you can do.

Most importantly, water plants during the daytime. Allow ample time for the leaves to dry before nightfall. Better still, water plants from the bottom, keeping the leaves dry.  

If plants are bushy, thin them to improve the air circulation and provide additional light to the remaining leaves.  

Its remarkable what these two tasks (above) will do to minimize powdery mildew, and other plant disease, too.

Treatment for Powdery Mildew: 

Apply fungicides as soon as the problem is identified. Better still, apply a fungicide just before the start of hot, humid weather in your area. Affected areas of leaves will not be cleaned of the white mildew. But, it stops the spread of the disease, and kills the existing mildew. Regular treatment with fungicide is recommended.

If the affected area is minimal, you can remove unsightly, affected leaves. If the disease has affected a large percentage of the leaves, removal of all of them may affect the growth of the plant.

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