Do not apply these materials on slopes of more than 4 percent when the ground is frozen. Many soils in southern Indiana are extremely low in P, and it will likely be the first nutrient after N that restricts yields. Less P in the soil is available to plants when soils are dry. Thus, adding P fertilizer helps prevent this nutrient from becoming the factor that reduces yields during dry periods. Yellowing may also indicate the presence of certain diseases.
Crown rust causes the field to become yellow or brown in appearance.
Fusarium wilt turns the field light yellow and later straw-colored. Dollar spot, which is observed during wet seasons or in fields with low nitrogen, causes white spots in the field. Selection of resistant varieties and proper management will minimize disease problems. Renovating Pure Stands Pure stands of tall fescue can be improved by renovation with a legume. Graze the fescue very close in the fall.