AT A GLANCE
Vinegar can help against powdery mildew on roses due to its low pH of three. Powdery mildew fungi require a neutral pH and cannot exist in acidic conditions. So that you do not damage the plants, you should pay close attention to the application.
How do I use vinegar for powdery mildew on roses?
vinegar is allowed only diluted applied to plants. The acidic pH of the home remedy would not only harm the mildew fungi, but also the plants. As acetic acid, you can use household vinegar from brandy or Apple Cider Vinegar use. Eight grams of vinegar in one liter of water are ideal for a spray solution. Do not use this mixture in sunlight and heat. This will enhance the effects of vinegar and thereby burn the rose petals.
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What do I have to consider when using vinegar on roses?
When using vinegar in the garden you should always to act with caution. Vinegar as a pesticide is generally prohibited on paved surfaces. Even if the roots of most plants only absorb small amounts of vinegar, the soil will quickly become acidic if treated several times. This also changes the mineral balance. Roses tolerate slightly acidic soil with a pH of 7 to 5.5. For multiple treatments, it is helpful to cover the soil around the roses before spraying.
Tip
Alternative means to acetic acid
Other acids are often recommended as home remedies against powdery mildew. Keep in mind that citric acid has a lower pH than household vinegar and lactic acid only has a pH of 2.44. Lactic acid should therefore only be used in the form of whole milk.
