Identification of Blumeria graminis (DC.) Speer on poaceae range plants and report of new hosts in Lorestan province and Iran

Poacea family with 120 genera has the widest distribution range among flowering plants in Iran. The family comprises important rangeland plants. One of the most common diseases of the plants is powdery mildew. In this research samples were collected from infected range plants in different localities of Lorestan province. Following determination of host plants, fungi organs were micrometeried. All macroscopic and microscopic characters were recorded and the fungal organs shapes were drawn and microscopic picture taken and compared using appropriate keys. Following species were identified as host plants for the fungus Blumeria graminis (DC.) Speer. Species with one or two asterisk are new record for the province and the country, respectively:**Bromus tectorum L., **Agropyrum podperae Nab., **Agropyrum pertenue (C.A.Mey.) Nevski, *Phalaris minor Retz., **Avena barbata Pott ex link, **Agropyrum elongatiform Drobov, *Aegilops umbellate Zhuk., *Aegilops triuncialis L., **Eremopoa persica (Trin.) Roshev., **Heteranthelium piliferum (Banks and Soland.) Hochst., *Hordeum bulbosum L.,**Elymus elongatiformis (Drobov) Assadi, **Aegilops caudate L., *Hordeum geniculatum All., **Hordeum violaceum Boiss. et Huet, *Hordeum marinum Hudson, **Bromus scoparius L., **Bromus danthoniae Trin., *Poa bulbosa L., **Lolium multiflorum Lam., **Lolium rigidum Gaudin, **Bromus Rechingeri Melderis, **Bromus tomentellus Boiss., **Agropyrum trichophorum (Link) Richter, *Hordeum sp., **Aegilops cylindrica Host, *Hordum glaucum Steud. and *Hordeum vulgare L., were the host of Blumeria graminis (DC.) Speer.