Lots of lawn owners know the problem – the beautiful, consistent green of the lawn gets disturbed by unattractive spots. This can have different reasons.
If you have spots on your lawn it does not necessarily have to be a fungus. This could also be caused by a wrongly used fertiliser or other chemical substances.
An unevenly applied fertiliser can increase stains on the lawn. This is shown by varying green shades. The midday sun could be another factor causing yellow spots. If the fertiliser was not rinsed well into the ground it will burn the lawn.
Maybe you have spilled some fertiliser while filling it in a spreader and you have not removed it sufficiently. That could also be an area where brown spots appear – the grass dies because of the fertiliser overdose. Equally, chemicals like engine oil or petrol could cause the same effect. Just one drop is enough to harm the sensitive soil. Because of that you should always make sure to stand on a firm, impermeable ground and to try not to spill anything. Chemicals do not just harm your lawn but also the whole environment.
If a point above should be the reason of your spots, you can easily remedy the bare spots by reseeding grass.
Fungi can cause spots with different colours like yellow, brown or white. They especially spread when the lawn is charged by frost, heat, stress and a long-lasting wet weather. Without accurate analysis you can often just guess what kind of fungus you need to deal with. However, there are some general rules:
- grey/white spots: Pink snow mould (Microdochium nivale), Powdery mildew (Blumeria graminis)
- yellow spots: Dollar Spot (Sclerotinia homoeocarpa), Take-all (Ophiobolus graminis)
- brown spots: red thread (Laetisaria fuciformis)
If your lawn gets too little water during dry summer months, individual spots or even whole areas might die. If this is the case, your lawn will need a reseeding in the next season since the grass cannot regenerate itself.