Large patch in zoysia

In the spring, I posted pictures of some large patch in some of our zoysia. We do a preventative treatment for the disease in the early fall on all of our zoysia areas including tees, fairways and green surrounds which totals over 30 acres of fungicide to be applied. The preventative treatment in the fall is then followed up with a spot curative treatment in the spring where we only treat actively visible disease. Spring activity is usually more severe because the turfgrass is weak coming out of winter and the soil has a tendency to be wetter in the spring which keeps the disease more active for a longer period of time.



Early last week, I noticed some pretty serious discoloration on the lake side of the 15th tee box. I investigated it later in the week and thought it could be damage from the Hunting Billbug larvae/grub which we have had some issues in the past. As I got closer to it I could see that it was actually large patch in zoysia. If memory serves me right, I don't think I have ever seen this disease work in August. The cool soil temperatures made conditions right for this disease to become active. We will probably have to do a spot treatment in this area and will probably begin to apply our preventative treatment in the next 7-10 days or so.



What a strange season it has been!


This spot is actually on the tee surface of #15 main tee and is on the left side of the tee and goes down in front of the tee. The outer edge of the circle is orange in color and shows that the fungus is actually growing and active.

The right front corner of 15 tee bank. My first thoughts were of insect damage but it turns out it is large patch on zoysia actively chewing away on this tee bank. This tee does face to the west but is under some pretty serious shade issues from 2 large oak trees behind the 14th green. We also have some moisture issues on this tee since the back of the tee is at ground level and excess runoff from the 10th fairway keeps this tee above average in moisture content.