A second survey of citrus orchards conducted in the districts of Phunakha, Wangdue Phodrang and Tsirang by the authors of this study commonly found powdery mildew on mandarin seedlings, trees and fruitlets (Fig. 1) of the one local variety grown. Powdery mildew was also found on Rangpur lime (Citrus limon (L.) Osbeck), Carrizo citrange (Citrus insitorum Mabb.) and Tsunokaori tangor (Citrus aurantium L.).