Downy mildew is sometimes called false mildew and affects vegetative as well as flowering cannabis plants. Powdery mildew occurs when temperatures are below 76° F (26° C) and it appears as a whitish-yellow spot on top of leaves, creating pale patches on leaves.
This can spread very quickly by causing plant growth to slow down, and leaves to die off, and can be fatal for cannabis plants. Do not promote disease by crowding plants too close together in your garden, but be sure to keep some space between them.
Cleanliness is the best preventative measure so always use sterile growing mediums and do not reuse them. For further infection, you will need to remove all leaves that are infected and throw them away.
Also, you can apply Bordeaux or a spray that contains Bacilius subtilis to the leaves.
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