What is the cause of white powder in rosemary plants?

This is how to get rid of powdery mildew from rosemary.

Milk Spray If you notice powdery mildew patches on rosemary plants, use a milk solution to spray them. Combine 1 part milk and 5 parts water in a spray bottle. Spray the affected foliage once per week until the disease has gone.

Powdery mildew can also be treated at home. Powdery mildew can be treated at home. Powdery mildew can be found on many kinds of cut flowers and vegetables in the summer. Powdery mildew can usually be avoided by using homemade remedies, which have been shown to work just as well or better than commercial fungicides.

How can you remove powdery mildew from herbs?

Mix one tablespoon of baking soda with one-half teaspoon liquid soap non-detergent soap in one gallon water. Spray the mixture liberally onto the plants. Mouthwash. Powdery mildew can be killed by the mouthwash that you use every day to kill germs.

What's the white stuff on my plants and what is it?

One of the most common plant problems is powdery mildew. This fungal disease affects plants stems and leaves, and coats them with a substance that looks like a gray or powder-like substance. Although the white coating can greatly reduce the plant's appearance, it is not fatal if it isn't controlled.