Empire Zoysia not looking so good

Hi there,

We are located in Brisbane and our lawn was laid by professionally back in August / September 2016. It was looking good until recently.
This summer our grass is looking worse and need your help. It has some brown patches and some burnt patches. I wonder what is the cause and how could I rectify this? Could this be the lawn grubs' doing?

I have not put any treatment yet and thought to ask the experts here what are the most effective ways. I would like to keep it chemical free as much as possible.

I usually give them a drink of Seasol / Powerfeed / Molasses every month (last time was early Dec), but I have been slack recently with the heatwave. We had some heavy rain over the last few days.

Is there anything else that might help with this tired looking lawn?

I noticed there are layers of thatch developing and I am using a solid steel rake to remove them at the moment. Wonder what is the best effective way to tackle this without breaking my back?


Another question: What are ways to address uneven lawn? Can I use compost to even it out? Or do I need some organic top soil?

Thanks for all your help
Hopa

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