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> Weed Chart
> Disease Chart

  
Disease Chart
TURFGRASS DISEASE CHART
Dollar Spot (Sclerotinia homeocarpa)
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Dollar Spot
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Diagnosis
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Small straw coloured patches of turf 2cm - 7cm in diameter.

 * Dollar Spot
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Management
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* Disease is more server under low nitrogen fertility.
* Limit thatch thickness.
* Avoid irrigation in late evening and prior to midnight.
* Spray with Mancozeb fungicide.
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Fairy Ring
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fairy ring
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Diagnosis
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Circles or arcs of mushrooms or wilted, dead or dark green turf. White fungal "mycelium" may be found in the thatch and soil around the circles and arcs.

 * fairy ring
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Management
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* There is no fungacide available to kill fairy ring. The fairy ring will eventually grow out.
* Maintain affected area with liquid wetting agent to prevent soil from becoming "oily".
Fusarium Patch
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Fulsarium
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Diagnosis
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Yellow to brown, irregular shaped patches of turf.

Leaf legions yellow with black centres.

Occurs in warm and wet conditions.

 * Fulsarium
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Management
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* Disease is more server under low nitrogen fertility.
* Avoid irrigation in late afternoon and prior to midnight.
* Reduce irrigation frequency to minimise the time the leaf blades are wet.
* Reduce thatch levels.
* Apply Greenkeeper fertiliser.
* Control fungicides include: TMDG (Thiram) and Mancozeb.
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Leaf Spot (Helminthosporium)
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Leaf Spot
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Diagnosis
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Round to oval chocolate brown spots on leaves.

Spots may have tan centres.

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Management
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* Avoid irrigation in late afternoon and prior to midnight.
* Limit thatch thickness.
* Maintain a balanced fertiliser program.
* Decrease shade and increase air circulation to enhance drying turf.
* Control fungicides include: Mancozeb.
Powdery Mildew
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Powdery Blue
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Diagnosis
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White powdery masses of fungai spores scattered over the surface of lawn blades.

 * Powdery Blue
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Management
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* Disease is more severe under excess nitrogen conditions.
* Maintain a balanced fertiliser progam.
* Control fungicides include: Mancozeb.
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Brown Patch (Rhyzoctonia Blight)
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Brown patch
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Diagnosis
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Circular patches of brown turf from 25mm to a metre in diametre.

Blades at margins of the patches have yellow irregular shaped legions with thin brown borders.

Patches are surrounded by smokey coloured ring of mycelium.

 * Brown patch
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Management
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* Avoid irrigation in late afternoon and in evening prior to midnight.
* Apply sulphate of potash - disease more severe on soils low in potassium.
* Limit thatch thickness.
* Maintain a balanced fertiliser program.
* Control fungicides inc: Mancozeb.
Pythium Blight
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Pythium
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Diagnosis
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Greasy brown patches or turf ranging from 25mm to 100mm.

A distinguishing feature is the grey white cottony mycelium that can be observed.

 * Pythium
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Management
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* Avoid irrigation in late afternoon and in evening prior to midnight.
* Disease is more severe under excess nitrogen conditions.
* Improve surface drainage.
* Do not mow infected areas when they are wet.
* Control fungicides include: TMDG (Thiram) liquid.
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Slime Mould
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Slime Mould
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Diagnosis
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Large amounts of these organisms may suddenly appear on grass blades and stems in circular to irregular patches 2-60cm in diametre. The sporangia are typically white, grey or purplish brown but other colours are also possible.

The affected patches of grass do not normally die or turn yellow and the sporangia usually disappears within 1-2 weeks.

* Slime Mould
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Management
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Control methods are usually unnecessary because these organisms are more unsightly than harmful. Some fungicides can be used to control slime moulds when they are abundant and become unsightly, simple removal is usually most appropriate:
* Wash the leaves with a stream of water
* Rake or brush slime moulds from leaves.
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