Downy mildew include in

Downy mildew includes in Oomycetes.
Downy mildew refers to any of several types of oomycete microbes that are obligate parasites of plants.
Downy mildew, is a disease of plants, especially in cool humid regions, caused by several fungus-like organisms of the phylum Oomycota. White, gray, bluish, or violet downy patches of mildew form mostly on the undersides of leaves in damp weather.