Brown Patch
Brown Patch is a relatively common disease whose causal agent is Rhizoctonia spp. and it can affect all turfgrass species during the summer months.
Problem Overview
Brown Patch is a relatively common disease whose causal agent is Rhizoctonia spp. and it can affect all turfgrass species during the summer months. The favourable conditions for its occurrence are warm humid weather patterns, particularly when soils are poorly drained and the sward is heavily thatched. As a result it is more commonly observed occurring on NZ Browntop or Fine Fescue lawns rather than ryegrass lawns. This disease shows as rapidly enlarging irregular or circular patches where the foliage turns purplish initially followed by a light brown coloration. Occasionally the turf will recover in the centre of the effected area and this will result in the appearance of a ring of diseased turf.
Solutions
Prevention is best effected by de-thatching the lawn to remove the surplus organic material. Furthermore address any drainage issues.
Other Similar Lawn Problems

Fairy Rings
The causal agent of this relatively common disease is fungi related to the Basidiomycete species.

Red Thread (Pink Patch)
The causal agent for red thread or pink patch is Laetisaria fuciformis and Limonomyces spp.

Dollar Spot
The causal agent for Dollar Spot is Sclerotinia homoeocarpa and all turf grass species can be affected.
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