Root Decline

Causal Agent: Gaeumannomyces graminis var. graminis

Susceptible Turfgrasses: Warm season turfgrass, chiefly Cynodon spp.


  • Irregular shaped, chlorotic patches from 20cm to 1m in diameter.

  • Patches once established continue to spread throughout the year.

  • Roots, rhizomes and stolons turn off white to dark brown in colour.

  • Dark black hyphae can be visible on root tissue as the fungus begins to colonise the root system.

  • Root length and density is compromised as roots die off and become black.

  • Patches of infected turf eventually die back with foliage turning tan to dark brown.

  • New shoots may recolonise infected areas but soon become infected and die back.

  • Patches may enlarge to reach diameter of 5m or more.

  • Affected patches do not usually heal rapidly and the centres are invaded/ colonised by weeds.

  • Less severely infected tissues often bear dark strands of mycelium oriented primarily parallel to the root axis.

Conditions Favouring Disease

  • Generally more active in spring and autumn months.

  • Has a higher tolerance to warm temperatures (>25°C) than Take All Patch.

  • Greatly enhanced on turfgrasses grown in soils with high pH.

  • Increasing acidity tends to suppress this disease.

  • Soil conditions favouring the disease include, light texture, low organic content, low or unbalance fertility, soil pH above 5.5.

Click to Download

Products to Use Root Decline

Dedicate Turf and Ornamental Fungicide

NEW Dedicate_1L_Straight_RGB

Dedicate turf fungicide contains two active ingredients with two different modes of action, providing curative and preventative control. It has a…

Read more

Headway Maxx


Headway Maxx combines the strength, longevity and broad spectrum of Heritage MAXX with the speed and early curative action of Banner…

Read more

Banner Maxx


Banner Maxx is an excellent choice as an early curative treatment, providing systemic broad spectrum control of major turf diseases including…

Read more

Looks like: