One way that plants can be harmed comes in the form of powdery mildew. Formed on the upper surface of leaves, this powder or black dots on leaves are spread by wind, and can infect brand new plants as well as old. The harm that is brought upon these plants causes them to ripen prematurely and have poor flavor.
To control mildews:
1. prune or stake plants to improve air circulation.
2. dispose of infected plants.
3. apply bicarbonate sprays to prevent the spread of infection.
Sprays that contain potassium bicarbonate and sodium bicarbonate prevent fungal spores from establishing themselves on plants. start spraying when your plants look great, before anything appears!
To create an effective spray, dissolve 1 teaspoon of baking soda and 1 drop liquid soap in 2 quarts water, mix well, and spray on plants. If the spray is too concentrated it may burn the plant foliage.
Work Cited: Rodale's Ultimate Encyclopedia of Organic Gardening (2009).
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