Return to Weeds & Diseases
- Affects mostly blue rye; seldom tall fescue.
- Most common in shaded areas or during periods of prolonged overcast
weather. In Southern California, along the coast and during the fall
rust is more common.
- Main cause — Excessive shade, humidity, and mowing low.
Cultural Practices — to minimize chances of disease:
- Symptoms — Affected leaves will have rust-colored spots form.
- Use a balanced fertilizer, but avoid applying high rates of
Nitrogen, particularly in late spring and summer.
- Water during early AM hours to allow grass leaves all day to dry
- Avoid frequent irrigation that keeps the leaf blades wet and
that results in water-logged/compacted soils.
- Mow at the upper end of recommended mowing heights (but not
above recommended mowing heights)
- Spray on a fungicide labeled for Rust if symptoms appear… repeat every
10 days until symptoms are gone… ALWAYS READ & FOLLOW LABELED