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This family contains about ten genera, of which the following are most commonly known: Phytophthora infestans, the potato blight; Plasmopara viticola, the downy mildew of grapes; Bremia lactucae, often causing great damage to lettuce in forcing-houses; Pythium Debaryanum, causing damping-off of seedling cucumbers and various other seedling plants; and Cystopus candidus, the common white rust of crucifers. Modes of combating these diseases are set forth for each specific case in the experiment station literature of the various states.
This family contains about ten genera, of which the following are most commonly known: Phytophthora infestans, the potato blight; Plasmopara viticola, the downy mildew of grapes; Bremia lactucae, often causing great damage to lettuce in forcing-houses; Pythium Debaryanum, causing damping-off of seedling cucumbers and various other seedling plants; and Cystopus candidus, the common white rust of crucifers. Modes of combating these diseases are set forth for each specific case in the experiment station literature of the various states.
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==Organic control==
Mix:
1 tablespoon of baking soda
1 tablespoon of liquid soap
1 tablespoon of vegetable oil
1 gallon of water
After mixing, apply on a spot test of one leaf or stem to check the plant’s response.
If there is no harm to your plant you can spray to the entire plant. Remember to apply your spray after watering the plant and early in the morning before sunrise to prevent burning of the plant, and maximize effectiveness.
Apply weekly to prevent powdery mildew from spreading further.