(Megan Kennelly, KSU Plant Pathology)
Thanks to Mark Newton at Deer Creek Golf Club in Overland Park for sending in these photos. Mark said it was alright to share where these came from – thanks Mark! We always appreciate reports and photos from the field. If you are okay with us putting your name on there, that’s great, and if you prefer to stay anonymous, that works too.
Anyway, Mark is seeing some early large patch in the zoysiagrass fairways. This past week has been hot, but we’ve had some cool spells that could have given the fungus a kickstart. And, we’ve had some rains, too. Large patch is favored by wet conditions. Symptoms are most common and tend to be most severe in spring, like April through early June. In the fall, we sometimes see symptoms in September, but it can occur earlier or later.
In fungicide trials at KSU we’ve seen good results suppressing symptoms the following spring by applying fungicides once in September. We’ve applied as early as Sept 3 and as late as Sept 30th and gotten good results with all those timings, using DMI’s, QoI’s, and flutolanil. The temperature in the thatch has been 65-70 degrees during those application timings.
Along with the large patch, there is some nutsedge action and a good pic of that is shown below as well.