Following on from a previous post about an oregano herb plant with powdery mildew, just wanted to update everyone on the organic treatment I used - which has been a success! Photo (left) of the plant with mildew. I had cut all the foliage off the plant thinking this may help, however, the new growth had powdery mildew on it, so I needed to find a solution (or throw it out)... I read an article that recommended using 20-30% milk mixed with water as a treatment for powdery mildew. I did this and it seems to have worked - photo of healthy leaves below.
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