Early infection appears as a Light yellow flecking of the leaves. As these flecks enlarge the spores which are orange in colour protrude from the infected foliage resulting in a "rust colour" visual to the naked eye. The orange pustules of spores become somewhat longer than broad and when numerous they are arranged in rows parallel with the veins of the leaves.
Temperature for onset of the disease is between 18 to 30 degrees celcius when the turf is not growing rapidly. Susceptible turf: Warm- and cool-season turfgrass species and varieties. Common on ryegrass and some zoysia species where growth is not as fast as other species of turf.
The damage can be visible within small clumps of turf to complete swards of lawn. In severe cases the disease can thin the turfgrass sward and the foliage can also become chlorotic.
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