How do I get my zoysia grass to grow and spread? I have done aeration, plenty of sun, water and hired a company to apply treatments

Question

I have had brown spots throughout my lawn for 2 years and they simply won’t get better with anything outside of replanting new zoysia. I put in some new sod in one section to see if it grows next to the old zoysia grass in my lawn and it grew just fine. I don’t understand why my old grass won’t grow but the new grass will. I have done everything recommended including aeration, fertilizer, compost, bagging grass during mowing and dethatching. I am a bit lost at this point as to why i have so many dark patches. The area with the dark patches has the zoysia growing MUCH slower than the areas with no visible dirt. Any and all suggestions would be most welcome, I don’t know what else to do. Uploading 2 pictures, both show the dark spots and some of the new sod, as well as some St Augustine starting to come in from the neighbour’s lawn since my Zoysia won/t grow.

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Answer 1

Have you tried a soil test, then fertilizing with the resulting recommendations? You might also try a fungicide. The articles below address these topics:

https://www.gardeningknowhow.com/lawn-care/lgen/brown-lawn-fixes.htm

https://www.gardeningknowhow.com/lawn-care/specific/zoysia/zoysia-diseases-tips-for-dealing-with-zoysia-grass-problems.htm