(Megan Kennelly, KSU Plant Pathology)
As I write this on Thursday we are looking into a weekend with forecast lows deep down into the 30’s. This comes after a September with multiple days in the 90’s and even more in the upper 80’s. Depending on how the weather shakes out after this weekend our warm-season turf may start showing signs of dormancy. Right now it is all still quite green.
In our cool season turf I’ve not seen much dollar spot lately, and it should be simmering down. I have heard a few reports of rust,
and my first suggestion in those cases is to review the fertility regime and make sure it’s not too low on N.
We are seeing and hearing reports of large patch across the region. Here is one example from today at our research facility in Manhattan:
Spring dead spot happens in … spring. But fall is a time to think about it. I’ll point you to an excellent summary of fall disease info from Dr. Miller next door in Missouri, with details about large patch, spring dead spot and other diseases:
(By Jared Hoyle, KSU Turfgrass Research and Extension)
Last week I came home after the KSU Turfgrass Annual Field Day that was held in Olathe, KS at the Olathe Horticulture Research and Extension Center and before I even made it into the house I knew I had rust in our back yard. The shoes in the garage were a dead give away. The shoes that my wife were wearing in the back yard were orange. This disease can occur just about anywhere, when the leaves of turf are wet and when plants are stressed they are more susceptible. We see it on perennial ryegrass but can occur on other species.
Don’t worry too much as the turf typically can grow out of it.
For more information on rust check out the KSU publication below, some past blog posts from Dr. Megan Kennelly and myself, as well as some information from Richard Jauron at Iowa State University.
(By Jared Hoyle; KSU Turfgrass Research and Extension)
Have you ever walked across your lawn or through a grassy area and when you stopped looked down and your feet were orange? (imaginary response – “No”) Ok, never mind then. Just kidding, well if you do then you might have rust in your lawn.
I received this picture the other week from one of my good friends in North Carolina with the quote underneath the picture that said “What the heck (it wasn’t that word but another one) is on my grass?”
I went through lots of questions with him and determined that he had rust. This is a disease that can occur just about anywhere. From a distance it can look like it has a yellow-grew cast to the lawn in large irregular spaces. It can leave your shoes orange and most commonly have outbreaks in the spring when the temperatures are milder. Well, we have had some of those temperatures around here too. So I got online and search through some of the KSU Agronomy blogs and found one that reported rusts on cool-season grassy crops. Then the reports started coming in from Kansas on turfgrass.
Even though this sample was from North Carolina keep a lookout for it around here. There are some cultural and chemical control options out there and can be found in the link below.
And here is some more information from Purdue.
All in all, a DMI or Qol (strobilurin) should give you good control.
***Mention of trade names or commercial products in this article is solely for identification purposes and does not imply recommendation or endorsement, nor is criticism implied of similar products not mentioned by Kansas State University.***
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