SR 4220 Perennial Ryegrass is specially designed
for its resistance to grey leaf spot, as well
as its extremely high fall density, excellent
winter color, red thread resistance and melting
out resistance. High endophyte material was
utilized in SR 4220 to insure insect resistance.
It is an excellent choice for golf courses,
sports fields or home lawns due to its dark
green color, good seeding vigor and fine leaf
texture.
HISTORY SR 4220 was developed
at Rutgers University in the fall of 1997
based primarily on its resistance to grey
leaf spot and its excellent heat tolerance.
Following rigorous testing at the Rutgers
Turfgrass Breeding program, superior seed
was sent for further trials at Seed Research
in the fall of 1998. In the spring of 1999,
it was noted that these maternal progeny had
two distinct heading and anthesis periods.
SRX 4801, now known as SR 4220, represents
the progeny from the 15 later transitioning
materials.
CHARACTERISTICS * Extremely dark green
color; Better winter color in permanent turf
* High turf quality with a fine leaf texture
and reduced stemminess
* Long term persistence - excellent cold and
hot weather performance
* Excellent winter color and winter density
when overseeded into dormant bermudagrass
* Early spring green-up in northern climates.
Very high spring, summer, fall and winter
density
* High billbug resistance due to high endophyte
levels
* Excellent leaf spot, dollar spot and crown
rust resistance; high red thread resistance
APPLICATION SR 4220's dark green
color makes it ideal for a variety of turf
applications. Blend SR 4220 with other peren-nial
ryegrasses for sod production, golf course
fairways or lawns. It also can be mixed with
Kentucky bluegrasses and fine fescues. In
blends with other perennial ryegrasses or
mixed with Poa Trivialis, its dark, dark green
color and high diseases resistance make it
ideal for overseeding permanent turf.
SEEDING RATE * New turf: 7-9 pounds
per 1,000 square feet or 300-400 pounds per
acre
* Overseeding rate:
30 pounds per 1,000 square feet for golf greens
250-450 pounds per acre for roughs
600-700 pounds per acre on fairways
* Seeds per pound: approximately 250,000
GERMINATION * Emergence in 3-7
days under proper conditions. First mowing
2 weeks after emergence.
