Identifying and treating lawn problems

YELLOWING GRASS

Cause:        May be due to the time of the year ie cooler months, or may be due to lack of fertiliser.
In cooler areas the warm season grasses (Sir Walter, Couch Grass, Kikuyu) will go dormant in the winter.
Remedy:     Fertilise all grass types regularly from early Spring through to late Autumn.


THINNING GRASS COVER

Causes:        May be due to lack of sunlight and/or lack of fertilizer or attack by cockchafers / corbie grubs
Remedy:      Cool season grasses can have a light topdressing of seed.
Fertilise all grass types regularly from early Spring to late Autumn. Use appropriate pesticides if an infestation of pest is confirmed. 


UNEVENESS OF SURFACE

Causes:        Further consolidation of surface after turf installed
Remedy:      Top dress hollow areas with coarse sand. Cover only 1/3 of leaf at each application.


DOG URINE BURN SPOTS

Cause:        Some dog have high concentration of nitrogen in their urine, this is influenced by the dog bred, its sex and what they eat. Too much nitrogen burns the lawn and creates yellow patches.
Remedy:
- Try changing the dogs diet so it is lower in protein which will lower the nitrogen level in the urine.
- The burnt patches can be watered to dilute the nitrogen in the soil
- The burnt areas can be treated with gypsum pellets which  help breakdown the soils.
- Dog Rocks added to the dogs drinking water will help to neutralise the dog urine. For more information on Dogrocks click here.
- In warm season grasses (Sir Walter, Couch, Kikuyu) the recovery of the patches can be accelerated by planting runners taken from other areas of the lawn.
- In cool season grasses (RTF, EasiCare, BlueBlend) can be seeded or fixed with replacement pieces of instant lawn.


SOIL pH LEVELS

- The ideal soil pH level for laying a new lawn is 6.0 to 6.5, up to 7.5 is ok.
- If under 6.0 soil is too Acidic and you need to add lime. Follow the instructions on lime packet. Lime can be laid on top of the soil just prior to laying the turf, but better results are achieved if the lime is rotary hoed into the top soil.
- Generally apply lime each year to control pH. Be careful around Acid loving plants such as Azaleas or Rhododendrons.
- Soil over 7.5 is considered alkaline. It is very unusual to have soil over 7.5. Needs elemental Sulphur products to reduce pH or you can use fertiliser that changes pH towards Acid, such as Sulphate of Amonia


WEEDS

Causes:        Weeds can be blown in and take most readily when the lawn is stressed from lack of water and /or insufficient fertilising. Best prevention is a well fertilised, strong health lawn.

Clover, all Broadleaf Weeds, Creeping Oxalis
Remedy:     Treat with Sir Walter Weed Control
Fertilise all turf types regularly to keep lawn strong and weeds at bay.

Wintergrass
Remedy:      Treat with Amgrow Chemspray Wintergrass Killer
Fertilise all turf types regularly to keep lawn strong and weeds at bay.

 

 PESTS - COCKCHAFFERS & CORBIES

Beetles lay eggs on the lawn, which hatch into the Cockchaffers lava stage which eat the grass roots

Remedy:     Treat with Sir Walter Grub Guard or Confidor spray.