How to Cure Mildew on Cucumbers

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Powdery mildew is a type of fungal disease that affects many types of plants, including cucumber plants. There are many kinds of powdery mildew but they all similar in appearance and needs. Although the best way to combat powdery mildew is prevention, it is one of the few fungal plant diseases that can be treated once it has set in. Several commercial fungicides can do the job or you can mix your own.

  • Identify the powdery mildew on your cucumber plants. It will look like white or gray powdery splotches on the leaves and stems of plants.

  • Remove the leaves and other parts of the cucumber plants affected by powdery mildew. This will prevent the fungus from spreading. Some whole plants may need to be removed.

  • Choose a fungicide that is specially formulated for vegetables, such as potassium bicarbonate. If you use one that is not formulated for edible plants, you run the risk of fungicide poisoning from eating the cucumber plants. Or, make your own spray using a teaspoon of baking soda, a quart of water and a few drops of liquid soap.

  • Spray the fungicide over the cucumber plants once a week. Wear goggles and gloves to prevent the fungicide from getting in your eyes or on your hands. Certain types of fungicide can be harmful if you get them in your eyes. Be sure to get thorough coverage of the leaves and stems.

  • Prevent other cucumber plants from developing powdery mildew by making sure the plants are located in a full-sun location. Avoid watering from above with sprinklers. Prune and weed around the plant to increase the airflow.

Tips & Warnings

  • Fungicide treatment should be started at the first sign of powdery mildew.
  • Read and follow all instructions that come with your commercial fungicide.

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