Powdery mildew in Southeast Asia: host range, impact, and sources of resistance

Powdery mildews are important obligate biotrophic ectoparasites that cause severe damage to various plant species in Southeast Asia. So far, 14 genera and 96 species of powdery mildew have been reported in Southeast Asia, with Thailand having the most number of recorded species. Of the 14 genera reported, Oidium sp. had the most recorded host, including several important species of vegetables, fruits, vines, herbs, field crops, ornamentals, and tree species. This paper briefly reviews the knowledge of powdery mildew disease in Southeast Asia, focusing on the pathogens' host range, impact, and some sources of resistance to powdery mildew.