Problem area in Zoysia Z52 lawn
We built and moved into a new home in October. We put in a zoysia Z52 lawn that was gorgeous when it was installed and continued to be gorgeous right up until it went dormant. This spring it has been beautiful and neighbors are always commenting on it. However, one very large area (approx. 15 ft. x 4 ft.) near the roadway suddenly began to look awful about 3 weeks ago. We are on a corner lot, so we have a lot of lawn that is adjacent to the roadway. Only in this one section does it look so bad. Close inspection shows brown foliage that is easily pulled, with very little green. It is well rooted and does not pull up easily, and I can see no evidence of insects. We bag all grass clippings to prevent buildup of thatch. We have had sufficient rain up until the past couple of weeks. We have run the irrigation system 3 times per week during this dry time. The soil feels sufficiently moist, just like the rest of the lawn, but looking at the grass itself, you'd think it wasn't being watered well. We have used the same lawn care company for feeding and weed prevention for several years. It has had 4 treatments since the first of the year ... the two earliest ones were pre-emergent for weed prevention, one time release fertilizer, one liquid application of iron and insecticide just last week (after the problem appeared).
We cut the grass at the recommended height for zoysia. We are totally at a loss as to the problem, and are very concerned that it is going to spread into the entire EXPENSIVE large lawn. Are there problems with this particular grass that are unique, that perhaps we are not aware of? We had learned, we thought, that this particular grass was the most trouble-free and beautiful of all.