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Weeds are very easily dispersed, so they're almost impossible to eradicate completely. Fortunately, just cutting your lawns a little longer encourages a dense growth habit, and helps grass to outperform weeds. Well-aerated soil is a much better option than compacted soil to prevent weeds getting a foothold.
Weed seeds can be transferred on shoes, in manure, by birds and animals, or even the mower. Many weed types can be removed by hand, but often a selective weedkiller (one that targets weeds but doesn't harm grass) is a more efficient option. Common lawn weeds such as dandelion, clover and creeping oxalis are all controllable with selective weedkillers.
Always check the suitability of the product you're using for the weed you are trying to remove. It's also a good idea to check the product is suitable for your lawn grass, especially if you have a kikuyu or couch lawn.
Grass grubs feed on grass roots just below the surface, causing the lawn to turn yellow, then brown and die. A classic symptom of grass grub infestation is if the lawn can be rolled up like a carpet.
Both porina and armyworm are caterpillars that strip grass foliage, causing rapidly expanding bare patches. Other symptoms of of grub or caterpillar infestations are birds pecking and scratching in the lawn.
You can control surface lawn pests such as armyworm, African black beetle and billbug by applying Yates Insect Killer for Lawns (before it has a chance to lay eggs). Apply in mid to late summer and autumn to control lawn armyworm.
Common lawn diseases include brown patch and dollar spot, which appear as dying spots and patches in a lawn.
Diseases can be more likely in lawn areas with compacted or poorly drained soil, in shaded areas, areas that remain damp overnight and underfed lawns. Only water lawns in the morning, so the grass has the chance to dry before nightfall. Keep the lawn healthy and well fed, to encourage disease resistance.
Lawn diseases like dollar spot and rust can be controlled with Yates Fungus Fighter Fungicide.