I saw some brown patch recently – in late September/early October!
In the meantime, our warm-season grasses are slowing down, and all the cool, cloudy, rainy weather this week may trigger some large patch in zoysiagrass.
Pathogens will take advantage of conducive conditions whenever they occur. Here are some great updates from my excellent turf pathology colleague Dr. Lee Miller, next door in Missouri:
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Many plant pathogens like to survive the winter in infected crop debris. One example is iris leaf spot.
Here is a zoom – the black spots are structures where the fungus produces spores:
So what can we do? Here are some tips from the Horticulture News (http://www.ksuhortnewsletter.org/):
Iris are known for a couple of common problems: a fungus disease known as iris leaf spot and an insect named iris borer. Though both cause problems in the spring, now is the time to start control measures. Both the fungus and eggs of the borer overwinter on old, dead leaves. Remove dead leaves and cut back healthy leaves by ½ this fall to reduce populations of these pests. Also remove other garden debris from the iris bed. This can significantly cut down on problems next spring. (Ward Upham)
Another disease that lurks over the winter is peony leaf blotch (also known as red spot or measles) and you can find info on that disease here on the Common Plant Problems website.
(Photos by Megan Kennelly)
Kansas Turf Conference in conjunction with KNLA
December 4, 5 & 6, 2018
Kansas Expocentre, Topeka
Mark the date to attend the Kansas Turfgrass Conference in conjunction with KNLA on December 4, 5 & 6 in Topeka.
The conference is an excellent way to learn about turf, nursery and landscape management, visit with old friends, network with new ones, and see all the latest equipment and supplies from local and national vendors.
The conference has been approved for Commercial pesticide recertification hours:
- 1 Core hour
- 3A – 7 hrs
- 3B – 7 hrs
- International Society of Arboriculture CEUs and GCSAA education points will also be available by attending the conference.
Download a copy of the program, get exhibitor information, or register online
Moderate days and cool, dewy nights have increased dollar spot pressure. Check out these photos in our research plots.
Here is an untreated plot:
Here is a cleaner plot:
There are many great tips about fungicides for managing dollar spot starting on page 15 of this document:
In terms of varieties, like other universities, KSU does a lot of screening of new breeding lines and existing cultivars. In our research plots we like to have big blocks of different cultivars for different reasons. In my fungicide trials, often I like to use susceptible varieties to make sure we get strong disease pressure. For other types of studies we like to use more resistant varieties when developing reduced-input integrated management strategies.
Here is an example of two varieties out on one of our research greens. They have not been sprayed, and they are not in use at the moment, but they show the striking differences in susceptibility:
I also noticed a tiny bit of lingering brown patch on our putting green. When we switch more solidly into cool fall weather that should fade into nothing. Ah, fall! Let’s have more nights in the 50’s!
If you squint hard, you’ll see the big brown patch circle among all the dollar spot: