Many places around the country are experiencing lots of rain. In addition, many of those I talk to have no idea that watering your grass every single night is a major reason for many soil born, root rotting grass diseases. Pythium is one of them. It is primarily a summer disease.
Pythium Blight is one of the worst diseases because of how quickly it spreads. It is often said that it is the only disease that you can actually see spreading. It is a form of pathogenic mold.
The spots that form are most obvious and are even worse in thick green lawns. They start at 1 to 4 inches in diameter and can follow the flow of water making long streaks.
Too much moisture is a major cause. Follow good watering habits and do not over-fertilize your lawn.
For more information, please read the email I sent to a customer below:
Pythium Blight Disease