How do you treat the soil once it's had that white powder plant mold?
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Just plain dirt?in garden?in house plants? in compost bin? it's from way too much moisture if you just stir it up and let it dry out it should be fine, putting soil in sun helps, lightly spritzing with vinegar or even sprinkling of baking soda if it's got fungus gnats too use 1/3 hydrogen peroxide and 1/3 water mixed put on soil after it's begun to get a little drier. are you sure it's mold could be heavy mineral deposits??
A recipe for Powdery Mildew is 4 tbsp of baking soda, 2 tbsp of Murphy's Oil Soap mixed into 1 gallon of water. Spray liberally on plants. Keep infected leaves picked up and do no not put them in the compost pile. Mold in the soil is not always bad as it shows that the decomposition of large pieces of matter is working.
Here's a good article with some tips: https://www.almanac.com/pest/powdery-mildew
Hi Charlotte, hope this helps you, to treat the soil afterwards,
Inoculate some powdery mildew spores on the surface of the soil by spraying some of the same fungicide used to treat powdery mildew on the foliage. Look for a product containing neem oil, sulfur, triforine or potassium bicarbonate and apply as recommended on the product label.