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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

 

 

 

 

 

 

 

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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.

 

 

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