Root Decline

Causal Agent: Gaeumannomyces graminis var. graminis

Susceptible Turfgrasses: Warm season turfgrass, chiefly Cynodon spp.

Symptoms

  • 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.

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Products to Use Root Decline

Dedicate

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10% Trifloxystrobin + 20% Tebuconazole Dedicate turf fungicide contains two active ingredients with two different modes of action, providing curative and…

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Headway Maxx

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6.2% Azoxystrobin + 1.04% Propiconazole Headway Maxx combines the strength, longevity and broad spectrum of Heritage MAXX with the speed and…

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Banner Maxx

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15.5% Propiconazole Banner Maxx is an excellent choice as an early curative treatment, providing systemic broad spectrum control of major turf…

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