A grey or purple-grey pall suddenly develops on an otherwise healthy lawn. The substance coats not only the turfgrass, but also any broadleaf or grass weeds in the lawn. Patches range from a few centimetres in diameter to (in extreme cases) in excess of a metre in diameter. On closer examination, grey sporangia (structures) may be may be seen on both the top and bottom of leaves. These range in size from 0.5 to 7.0 mm (if they have grown together). As they mature and rupture they release masses of dark brown spores. As the organism dries off, an ash-coloured and calcium-rich powder is formed. This transfers readily onto other objects if brushed.

Key Methods for Control:

• Slime mold usually doesn't require control and will disintegrate on its own within weeks. You can also remove the spore masses by raking, mowing, or using a strong stream of water. Dethatching with a steel-tined rake or dethatching machine can also help reduce food sources and humidity.