Several resistant varieties of perennial ryegrass, fescues, and Kentucky bluegrass are available. There is a full range of downland grass species, especially fescues and bents. The larvae feed on the roots of various grasses, including fescues. The larva feeds on various grasses, including reedgrasses, tussock grasses, fescues, canarygrasses, and ryes. Many of these fescues are considered noxious weeds in many places. Subsequently, Alexeev was going to create a monograph of fescues worldwide. As a doctoral dissertation he prepared an iconography of fescues, which remained unfinished. Ryegrasses are naturally diploid, with 2n=14, and are closely related to the fescues ("Festuca"). Fine fescues are generally used in mixtures with other grasses. In North America the cutworm can be found on fescues in alpine tundra habitat. Heather moor containing ling, bell heather, cross-leaved heath, bog myrtle and fescues is everywhere abundant.