Diseases

 

Diseases that affect your lawn can be roughly divided into two categories:

Turf Foliar Disease: Foliar diseases come in a range of spots and marks on the leaves of the grass. For example, you may have seen tiny orange coloured blobs on grass leaves from time to time. These are indicative of the presence of the rust fungus. Most of these foliar diseases are often 'cured' in the home situation when the grass is next mown and the spots disappear. 

Turf Root Disease: The root diseases are caused by a wide range of fungi and can be difficult to diagnose. Sometimes there are few symptoms that anything is wrong except that perhaps the grass is not growing as vigorously as it should or used to. Because the root system is damaged the plant can't uptake nutrients and water and shoot growth is slowed or stopped. 

If you do not wish to spray any pesticides, please visit our Turf Services section to see if a local contractor is available in your area once you have identified what disease or diseases require control.

 

Turfgrass Diseases

In the home situation, the severity of diseases is rarely enough to warrant fungicide applications unless you are wanting to maintain a high turf standard. Prevention is a better approach, which includes encouraging steady growth of your turf through the use of slow release granular fertilisers and ensuring irrigation occurs at times when water won't sit on the leaf surface for long periods. Many fungi require the presence of high moisture and humidity to attack, so irrigating very late in the day or at night when the water can't evaporate can increase the chances of infection, while watering when the leaf surface can dry relatively quickly will decrease chances of infection.

Below we have provided a range of turfgrass diseases that are found and can result in causing damage to warm- and or cool-season turfgrasses. Included within each disease thumbnail are technical descriptors and control options for both the home owner and professional sports turf ground manager or superintendent. For further information on pesticide regulations and what you can legally spray, please visit our Pesticides page

 

Algae

Nostoc, Oscillatoria, Chlamydomonas and Anabaena spp.

 

Anthracnose

Colletotrichum graminicola and Microdochium bolleyi

 

Brown patch

Rhizoctonia spp.

 

Couchgrass decline

Gaeumannomyces graminis var. graminis

 

Couch smut

Ustilago cynodontis

 

Dollar Spot

Clarireedia spp.

 

Fairy ring

Basidiomycete fungi

 

Fusarium

Microdochium nivale

 

Grey slime mould

Physarum cinereum

 

Helmo

Drechslera spp., Bipolaris spp. and Exserohilum spp.

 

Kikuyu Yellows

Verrucalvus flavofaciens

 

Leaf Spot

Drechslera, Curvularia and Pyricularia spp.

 

Leptosphaerulina Leaf Blight

Leptosphaerulina australis

 

Pythium

Pythium spp.

 

Red thread

Laetisaria fuciformis

 

Rust

Puccina & Uromyces spp.

 

Spring Dead Spot

Ophiosphaerella korrae