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Lawn discoloration #756626

Asked June 16, 2021, 3:24 PM EDT

Over the past few weeks I have noticed that my otherwise healthy turf grass has been getting some discoloration in patches around the lawn. This specific section of my lawn is the only section of my grass that is regularly irrigated and fertilized. Other sections of my lawn do not have this issue. In any case, I can't seem to determine the cause of these discolored patches. I am thinking this might be either disease (fungus) or perhaps insect damage, but don't have a ton of evidence for either. I will attach pictures that I have of the lawn up close which lead me to believe that this is caused by fungus/leaf spot. I have done some digging in my yard and have found a couple grubs in random places, but not any grub infestations. I also have seen some "moths" flying out of the lawn when I have been mowing. I regularly mow my lawn between 3.5-4 inches tall. Can you help me identify what is the cause of this discoloration?

Oakland County Michigan

Expert Response

Hello Kyle,

Based on your images - I do think that there are fungal and brown patch issues. It sounds like there are even some insect issues too. I don't think the problem could be a non-disease problem like irrigation issues, heat stress, pesticide damage, or compaction

I recommend you get a confirmed diagnosis from the MSU Diagnostic Plant Lab - Please send your images to the MSU Diagnostic Plant Lab. The lab strongly encourages clients to email digital images prior to bringing or sending physical samples. Images can be sent to <personal data hidden>. There is a $20-25 dollar fee. Their website has the form and instructions: https://www.canr.msu.edu/pestid/

When you are ready to send a sample - Details of submitting a sample are at this link: https://www.canr.msu.edu/pestid/submit-samples/

(Please make sure you read their important notice to their clients)

Residential Turf Sample

Include a square of turf from the margin of the diseased area so that both healthy and diseased turf is included. Minimally, the turf square should be 6 inches x 6 inches. An intact layer of soil should remain on the root system. Wrap samples in newspaper and pack them in a box for shipment. Do not add moisture to the turf prior to shipment. Provide a detailed description of cultural practices (irrigation, fertilization, pesticide application, etc.) and images of the symptoms in the lawn with the sample.

Ship/Deliver Samples Directly at:

MSU Plant & Pest Diagnostics
578 Wilson Road, CIPS 107
East Lansing, MI 48824


Hope this helps!!

An Ask Extension Expert Replied June 17, 2021, 4:28 AM EDT

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