Q.Zoysia, Fungus
I have a new zoysia lawn, 4 weeks old. I have just noticed several areas with the tips of the grass leaf turning white. At first I thought something had been spilled. Is this a type of fungus?

Hopefully, this article will help: https://www.gardeningknowhow.com/lawn-care/specific/zoysia/zoysia-diseases-tips-for-dealing-with-zoysia-grass-problems.htm
You might want to contact the zoysia vendor about this.

This link will take you to a group of articles about zoysia grass: http://www.google.com/cse?cx=012078378210706707791%3Af1h5n_k1r5e&ie=UTF-8&q=zoysia+grass+problems&oq=&gs_l=#gsc.tab=0&gsc.q=zoysia%20grass%20problems&gsc.page=1
If you can't find your answer, I suggest you contact the vendor, especially since the lawn is only 4 weeks old.

If your lawn is only 4 weeks old, I would ask the vendor about the discoloration. I've attached a link to several articles about zoysia grass: http://www.google.com/cse?cx=012078378210706707791%3Af1h5n_k1r5e&ie=UTF-8&q=zoysia+grass+problems&oq=&gs_l=#gsc.tab=0&gsc.q=zoysia%20grass%20problems&gsc.page=1