Lawn Disease - Ask Extension
Hi I have an ongoing problem with what I believe is a Fungal Disease named Microdochium Nivale. This was first notice about 3 years ago and seems to...
Knowledgebase
Lawn Disease #873841
Asked June 19, 2024, 6:51 PM EDT
Hi I have an ongoing problem with what I believe is a Fungal Disease named Microdochium Nivale. This was first notice about 3 years ago and seems to get worse each year as soon as the weather warms. Additional water does not help and have tried insecticides as well. I live in Bend Oregon and need advise on what this is and how to treat it with chemicals.
Thank you,
Steven Newton <personal data hidden>
Deschutes County Oregon
Expert Response
based on the photos and the season, spring and summer months, I would guessing you are getting anthracnose on annual bluegrass that has invaded your lawn. I would reseed or sod these areas with Kentucky bluegrass in the fall.
If you want to keep the annual bluegrass alive in the summer, it will require fungicide applications (to precent the anthracnose), and daily irrigation.
Good Morning, Thank you for the response identifying ANTHRACNOSE as the problem in my lawn. On a visit to the Redmond office the problem was identified as either NECRONIC RING or SUMMER PATCH. Therefore my question would be what fungicide I should use and is there something that works on all these.
Thanks for the help
Steve
If it is necrotic ring spot or summer patch a systemic fungicide (propiconazole and/or azoxystrobin), should be applied in the fall and/or spring months before summer drought stress. Reducing thatch accumulation with hollow tine core cultivation will also help reduce the disease activity.
Thank you for the clarification.
