Parent plants were selected from various populations for resistance to Fusarium wilt and powdery mildew and for vegetative vigor and persistence in a three year old Wisconsin spaced-plant nursery. Seed was bulk harvested from all parent plants. Impact has been tested in Wisconsin. The intended use for Impact is for hay, haylage, greenchop, or pasture. Maturity and plant height of Impact are similar to the variety Marathon.
Flower color is predominantly medium pink and plant color is dark green.
Growth habit of Impact is semi-erect to erect. Seed increase of Impact is on a limited generation basis with one generation of breeder and two generations of the foundation and certified seed classes. Production of Syn.3 foundation seed requires consent of the breeder. Breeder seed was produced under cage isolation near Woodland, California in 1990. Stands of foundation and certified seed fields are limited to 3 years.