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Anthracnose

Causal agent: Colletotrichum spp.

 

Description
Anthracnose typically infects turfgrass, particulary Wintergrass during warm weather when the turfgrass canopy is wet and or humid.

 

Susceptible Turfgrasses
Wintergrass, Bentgrass, Kentucky Bluegrasses, Fescue & Couch.

 

Symptoms

  • Leaves of infected plants turn yellow to a light tan to brown before dying.

  • Younger leaves often turn red.

  • Basel stem & leaf sheath's rot, affected plants are easy to pull out.

  • Infected areas are seen as irregular shaped patches.

  • Affected patches are a reddish brown colour turning yellow then tan to brown.

  • A black stain may occur at the base of infected plants, this is an acervulus, a black fungal fruiting body

 

Acervulus with setae visible with a microscope.

 

Conditions favouring Disease

  • Disease development is favoured by warm humid conditions.

  • Anthracnose favours temperatures over 25°C.

  • It is necessary for a film of moisture to be present on either the roots or foliage for infection to occur.

  • More than 10 hours a day of leaf wetness for consecutive days.

  • Hot summers in cool temperature areas are when the disease is most noticeable.

  • Soil compaction and low amounts of nitrogen also contribute to disease occurence.

 

Integrated Turf Management

  • Preventative fungicide program during high risk periods.

  • Decrease traffic.

  • Maintain adequate nitrogen and balanced fertility.

  • Do not core or aerate while disease symptoms are present.

  • Avoid management practices which encourage humidity and extended leaf wetness.

 

Fungicidal Control Preventative applications provide optimum control of anthracnose.
The following products have label recommendation for Anthracnose control in the South Africa:

 

Banner

Heritage

Mode of action

Systemic

Systemic

Optimum timing

During conducive conditions

During conducive conditions

Dose rate

2l-4l/ha

560g/ha to 1.12kg/ha

Water volume

400 to 1000 l/ha

400 to 1000 l/ha

Refer to Label for full details

 

Suggested Programme Once conditions conducive to anthracnose occur, or Greencast indicates high risks of disease a preventative application of either Heritage or Banner should be applied.