How to Control Lawn Rust

How to Control Lawn Rust

Lawn RustLawn rust is a common fungal lawn disease that can turn normally healthy green grass an unpleasant shade of yellow.

It can quickly spread and, because it interferes with the ability of plants to photosynthesise and grow, cause turf to weaken and thin.

Lawn rust is most commonly found during humid weather in spring, late summer or autumn, and in lawns that are stressed, underfed or improperly watered.

At its worst, lawn rust can result in dieback, leaving bare patches that will need to be repaired.

Fortunately, it is one of the easiest diseases to get rid of, especially when addressed early on.

The first step in treating lawn rust is identification.

How to Identify Lawn Rust

Lawn rust can seemingly appear overnight. It starts off as yellowing of the grass blades, developing as patches of orange to brown dust on the leaf. If you gently rub an infected leaf between your fingers, the powdery dust will come off, but the leaf remains discoloured.

In advanced cases of lawn rust, orange pustules can appear on the blade. They may turn black as winter approaches and will eventually burst, releasing numerous spores.

The tiny spores can spread easily on the wind or by sticking to shoes, clothing, garden tools, pets and even insects.

All grass types can develop lawn rust, although some are affected more than others.

How to Remove Lawn Rust

There are several methods for treating lawn rust. In most cases, it can be fixed in a matter of weeks by changing how the lawn is managed.

There are three things you can do:

  1.   Apply a quick-release nitrogen-rich fertiliser to stimulate leaf growth. myhomeTURF recommends xx fertiliser
  2.       Provide deep watering at longer intervals
  3.       Mow frequently to the optimum length for the variety. Then bag the clippings and put them in the bin, not on the compost heap.

If all else fails, there are several fungicides that can be used as a lawn rust treatment. myhomeTURF recommends products containing the active ingredient mancozeb, which should always be applied according to the directions on the label.

How to prevent lawn rust

Ensuring you have a strong, healthy lawn provides the best defence against attacks from pests and diseases like lawn rust.

Water Your Lawn

Watering LawnMost varieties need about 2.5cm-4cm of water each week from rainfall or irrigation. But rather than watering grass frequently for short periods, get into the habit of giving it a good soaking less often. Lawns don’t need daily watering, so try pushing it out to two or three times a week.

Turf will tell you when it needs water – look for a slight curling of the leaves which might appear faded. If you’re not sure, try walking across the lawn. If it needs water you’ll be able to see footprints where you’ve been. If the blades spring back into shape it’s a sign the grass has access to enough moisture.

Deep watering encourages the roots to grow deeper, making the plants more resistant to dry periods, so aim to get water into the soil below the root zone, to a depth of 15-20cm.

When using automatic sprinklers, regularly doublecheck they’re delivering the right amount of water – not too little and not too much – and there are no overlaps or missed areas.

Warm, cloudy and humid weather, or even cool nights with heavy dew or frequent rain that keeps the grass damp, can encourage fungal diseases like lawn rust.

If you can, set the timer to water lawns in the morning not at night. This gives grass the opportunity to absorb water before it evaporates and dry off any excess during the day.

Fertilise Your Lawn

Fertilising your lawnA vigorously growing lawn that receives regular applications of nitrogen-based fertiliser will be much more resistant to fungal diseases like lawn rust.

Aim to feed the lawn four times a year.

Twice in spring and again in late summer and autumn, with a slow-release product suited to the variety and soil types it’s growing in.


Mow Your Lawn

As a rule of thumb, mowing should remove only one-third of the grass.

mowing lawnRegular mowing encourages better air circulation and can stop disease in its tracks. Use a catcher or rake up clippings and dispose of them to prevent disease from developing under the clumps.

Trim trees or shrubs that hang over the lawn to improve airflow and expose grass to sunlight.

If thatch is thick, break it up with a thatching rake and use an aerator to reduce soil compaction. This makes it easier for water and fertiliser to reach the roots and stops water from sitting on top where it can encourage fungal diseases like lawn rust.

There are more mowing tips here and here.

Last but not least, maintain good garden hygiene by regularly cleaning mower blades and other garden tools which can transfer disease.


Free Lawn Guide

Sign up for our Newsletter to receive your free ...

View our Privacy policy

Related Articles

Safety comes first when using lawn chemicals

Proper Personal Protective Equipment (PPE) is a good investment, especially when working with volatile products on and around your lawn. Most people have a natural aversion to ...

Read More

Common Lawn Diseases

When disease attacks your turf, control can be difficult unless you know how to identify lawn diseases and understand the causes and prevention behind them. Is it Dollar Spot ...

Read More

Controlling Black Spot on lawns

COMMON CAUSES Heavy rainfall Heat Humidity Over watering Incorrect lawn management Black Spot is characterised by black spots on the upper side of your lawn’s leaves and ...

Read More
yellowing lawn

Lawn is becoming Yellow or Browning

Your lawn may turn yellow or brown due to several things such as, being sick with a disease, having gone dormant or simply nutrient deficient. Once you identify why your lawn ...

Read More

Brown Patch in Buffalo Lawn

If your new Prestige®, Palmetto®, or Sapphire® Buffalo Lawn has developed circular patches of dead, brown or dying turf areas, then the most likely cause will be a lawn fungus ...

Read More

How to edge your lawn like a pro

Why edge your lawn? There’s nothing quite like a clean edge to add the finishing touch to a healthy well-manicured lawn. It’s not just about aesthetics, because there’s a ...

Read More
Grasshopper in lawn

How to get rid of Grasshoppers in your lawn

The occasional Grasshopper or Locust won’t cause much damage to your lawn, it’s only when they descend on your garden in large numbers that you need to think about taking ...

Read More

How to remove Couch Mites in your lawn

Couch Mites are tiny pests that are visible only through a magnifying hand lens or microscope. The translucent bodies of juvenile mites are just 0.1mm to 0.15mm long and the ...

Read More

How to remove White Clover from your lawn

White Clover is easily recognisable from its smooth trifoliate leaves but once established can require patience to beat. A hardy, herbaceous perennial plant that tolerates ...

Read More
white worm lawn grubs

Lawn Grub Control for your lawn

Did you know Lawn Grubs are one of the most common garden pests in Australia? Or that there are more than 2200 species native to Australia? Spring and summer is the peak ...

Read More