Description:
Plants selected from Central Park in New York City, NY, were the original maternal source of the Lolium endophyte present. A plant selected from PI 231597 (Greece) was the donor parent in a modified backcrossing program. The third backcross involved large numbers of unrelated turf-type ryegrasses as recurrent parents, including plants selected from Manhattan, Citation, and Pennfine and other turf-type perennial ryegrasses selected from old turfs in Maryland, New Jersey, Pennsylvania, and New York.