Festuca nigrescens Lam.

are host of

• Global Biotic Interactions: Gaeumannomyces tritici (J. Walker) Hern.-Restr. & Crous 2016 (Take-all)
• Global Biotic Interactions: Ramularia pusilla Unger 1833
• Global Biotic Interactions: Lycoperdon pratense Pers. 1794
• Global Biotic Interactions: Mycosphaerella recutita (Fr.) Johanson 1884
• Global Biotic Interactions: Pyrenophora phaeocomes (Rebent.) Fr. 1849
• Global Biotic Interactions: Colletotrichum graminicola (Ces.) G. W. Wilson 1914
• Global Biotic Interactions: Spodoptera eridania Stoll 1781 (Southern Armyworm Moth)
• Global Biotic Interactions: Waitea circinata Warcup & P. H. B. Talbot 1962
• Global Biotic Interactions: Agaricus arvensis Schaeff. 1774
• Global Biotic Interactions: Gloeotinia granigena (Quél.) T. Schumach. 1979
• Global Biotic Interactions: Sclerotinia homoeocarpa F. T. Benn. 1937 (Dollar spot)
• Global Biotic Interactions: Calvatia gigantea (Batsch) Lloyd 1904
• Global Biotic Interactions: Epichloe typhina (Pers.) Tul. & C. Tul. 1865
• Global Biotic Interactions: Agaricus campestris L. 1753
• Global Biotic Interactions: Puccinia festucae Plowr. 1893
• Global Biotic Interactions: Claviceps purpurea (Fr.) Tul. 1853
• Global Biotic Interactions: Marasmius oreades (Bolton) Fr. 1836
• Global Biotic Interactions: Ustilago striiformis (Westend.) Niessl 1876
• Global Biotic Interactions: Thanatephorus cucumeris (A. B. Frank) Donk 1956
• Global Biotic Interactions: Lycoperdon utriforme Bull. 1791
• Global Biotic Interactions: Calvatia cyathiformis (Bosc) Morgan 1890