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Dandelions in summer patch areas from last year

May 24, 2016

On July 6, 2015, I posted a blog about summer patch, caused by (Magnaporthe poae), on the turfgrass research area.  It was a major outbreak of this disease.  In late May, a few days ago, I was looking at the area.  The disease is not active now, but the interesting thing about the area is how dandelion seed landed in the dead part of the rings and germinated in the fall and spring. 


The first two pictures are from the post on July 6 of last year when the summer patch was active.  The last 4 are from May 20, 2016 showing the dandelions.  The dandelions had been treated with a broadleaf herbicide a week earlier.




From May 2016









It Is Summer Patch Time In Iowa

June 16, 2016

Here are a couple of great pictures from Nicholas May of True Green lawn care in Des Moines.  These pictures were taken south of Des Moines this week.  The disease is summer patch, caused by (Magnaporthe poae). 

For more information on this disease, search "summer patch" in older editions of this blog.

Summer patch requires systemic fungicides applied before symptoms develop.  If you have a condition like this that has already developed, you will need to core aerify in late summer and let it recover.  Watering the area next year will help and systemic fungicides applied before symptoms develop next May will help.  There is no reason to treat it with fungicides at this time.




Brown Patch Outbreak

September 2, 2016

This has been one of the worst years for Brown Patch caused by the fungi Rhizoctonia soloni that I can remember.  This organism attacks several grass species.  We saw a lot of it in Tall Fescue this year, I also saw it in Kentucky bluegrass, and of course, it usually hits creeping bentgrass every year.  This morning at the research station, we had one of the worst outbreaks I have ever seen on creeping bentgrass green.  The attached video shows the extent of the damage.

Brown patch usually goes away with a weather change and the damage recovers quickly.  You can also treat it with fungicides.  We decided not to treat the green with fungicides at this time because our NTEP bentgrass trial is on this site.  Hopefully I can get some data on differential damage to the various experimental cultivars.  If that happens, I will do another blog on the damage.


Here is the video.  Notice the classic "halo" around the outside to the blighted area.

The symptoms went away after 3 days.  We will let you know if they return.