Panther GLS is an elite, new generation, heat and humidity tolerant perennial ryegrass developed with improved gray leaf spot resistance. Gray leaf spot disease has been a limiting factor to the establishment and persistence of perennial ryegrass in the past decade in the Mid Atlantic, Mid South and Midwestern U.S. Panther GLS is also an endophyte enhanced perennial ryegrass with >90% Neotyphodium lolii endophyte which provides resistance to a number of leaf and crown feeding pests and improved tolerance to abiotic (non-living) and biotic (living) stress. It is highly recommended for permanent turf application in the Mid-Atlantic and U.S. transition zone where heat and humidity may limit the adaptation of perennial ryegrass turf.