Lolium: Common member of the Gramineae family used as cattle FODDER. It harbors several fungi and other parasites toxic to livestock and people and produces allergenic compounds, especially in its pollen. The most commonly seen varieties are L. perenne, L. multiflorum, and L. rigidum.Festuca: A plant genus of the family POACEAE. The common name of fescue is also used with some other grasses.Herbicide Resistance: Diminished or failed response of PLANTS to HERBICIDES.Poaceae: A large family of narrow-leaved herbaceous grasses of the order Cyperales, subclass Commelinidae, class Liliopsida (monocotyledons). Food grains (EDIBLE GRAIN) come from members of this family. RHINITIS, ALLERGIC, SEASONAL can be induced by POLLEN of many of the grasses.Epichloe: A genus of ascomycetous fungi in the family Clavicipitaceae, order HYPOCREALES, which are fungal symbionts of grasses. Anamorphic forms are in the genus NEOTYPHODIUM.Neotyphodium: The anamorphic form of the fungus EPICHLOE. Many Neotyphodium species produce ERGOT ALKALOIDS.Hypocreales: An order of fungi in the phylum ASCOMYCOTA that includes a number of species which are parasitic on higher plants, insects, or fungi. Other species are saprotrophic.Poa: A plant genus of the family POACEAE that contains the Poa p Ia allergen and allergen C KBGP.Fructans: Polysaccharides composed of D-fructose units.Ergotamines: A series of structurally-related alkaloids containing the ergotaman backbone structure.