What fungicide should be used for Rhizoctonia Blight? I seem to have these...

Asked September 30, 2019, 5:08 PM EDT

What fungicide should be used for Rhizoctonia Blight? I seem to have these circles in my lawn in Sisters, OR. and would like to get rid of them.

Deschutes County Oregon lawns and turf

1 Response

Hi, Most turfgrass damage is due to environmental factors not plant disease in central oregon. The two most common types of plant disease that display as circes if it is a plant disease (bacteria or fungus)found in turf in Central Oregon is Fairy Ring and Necrotic Ring Spot.
Management of Fairy Ring: https://pnwhandbooks.org/plantdisease/host-disease/lawn-turf-fairy-ring-mushrooms
Management of NRS: https://pnwhandbooks.org/plantdisease/host-disease/lawn-turf-necrotic-ringspot
Damping off is a type of Rhizoctinia but is not common in Central Oregon: here is suggested management for that disease: https://pnwhandbooks.org/plantdisease/host-disease/lawn-turf-dampinge:

I would recommend you confirm what is causing the damage before spending money on a chemical that may or may not work. You can start with sending in photo of the damage or by sending a sample to the plant disease clinic in Corvallis. Feel free to contact me below with questions. Thanks