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Wheat stripe rust, caused by  Puccinia striiformis  f. sp.  tritici  ( Pst ), is one of the most serious threats to wheat production worldwide. Changes of  Pst  virulence may circumvent resistance in wheat varieties, and application of fungicides may cause environmental problems. Parasites of  Pst  can be used to develop biological agents for environmentally friendly control of this fungal disease. Here, we report a hyperparasitic fungus isolated from  Pst  and identified it as  Simplicillium obclavatum  through molecular and morphological characterizations. We demonstrated that inoculation of  Pst -infected wheat leaves with  S .  obclavatum  reduced the production and germination rate of  Pst  urediniospores. Therefore,  S. obclavatum  has the potential to be developed into a biological control agent for managing wheat stripe rust.

Identification of a Hyperparasitic Simplicillium obclavatum Strain Affecting the Infection Dynamics of Puccinia striiformis f. sp. tritici on Wheat