Rust
There are lots of different rust diseases in horticulture some which affect turf grasses. The more susceptible grass species are Perennial Ryegrasses and Smooth Stalked Meadow grasses.
The most common time of year for infection to occur is early summer through to the late part of autumn. As with other turf diseases, humidity, low fertility and infrequent mowing regimes are common causes.
The infected grass appears rust coloured due to the production of copious yellow and orange spores on the leaf surface.
Reduced incidence and control can be achieved through adequate fertility, regular mowing and if necessary the use of a plant protection product.