Oidium

Oidium is a genus of Deuteromycetes, where traditionally most anamorphs of the order Erysiphales are included. Most of them are plant pathogens causing different forms of powdery mildew, for example: Oidium alphitoides (= O. quercinum) = Microsphaera alphitoides (on oaks) Oidium anacardii (= Acrosporium anacardii) (on cashew) Oidium arachidis (on peanut) Oidium asteris-punicei (= Erysiphe cichoracearum) (on mangos) Oidium balsamii = Erysiphe verbasci (on mulleins) Oidium begoniae (=O.cyclaminis, O.lini, O.violae) = Erysiphe polyphaga (on Valerianella, Calluna and Erica) Oidium candicans (= Monilia candicans) Oidium caricae (on papayas) Oidium caricae-papayae (on papayas) Oidium caricicola (on papayas) Oidium chrysanthemi = Erysiphe cichoracearum (on numerous plant species, especially Asteraceae) Oidium carpini Oidium chartarum (= Torula chartarum) Oidium cyparissiae (= Acrosporium cyparissiae) (on cypress) Oidium erysiphoides = Sphaerotheca fuliginea (on melons, watermelons and cucumb......read more on Wikipedia.