Take All Patch

Causal Agent: Gaeumannomyces graminis var. avenae

Susceptible Turfgrasses: Bentgrass

Symptoms

• Small, light brown dead patches appear on turf.

• Patches once established continue to spread throughout the year.

• Stressed grass appears bronze to reddish brown and then fades to a dull brown.

• During winter affected patches turn grey.

• In pure Bentgrass stands a circular or ring-shaped dead spot occurs.

• Patches may enlarge (up to 15cm a year) to reach diameter of 1m or more.

• Or patches may appear briefly and then cease to spread.

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

• In mixed stands, the Bentgrass appears yellow-brown to brown, leaving a thinned overall stand dominated by Wintergrass or Fescue.

• Stolons, rhizomes, roots and bases of shoots become dark brown to black before they are killed.

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

Conditions Favouring Disease

• Severe during cool, wet years and in poorly drained turf.

• 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