We are monitoring throughout NJ, PA, NY, CT, and MA for the disease and will post a warning as soon as it is identified. It attacks only perennial ryegrass and tall fescue, and so far has been a problem primarily on golf courses rather than lawns and athletic fields. It is impossible to separate this leaf spot disease from typical Helminthosporium-type leaf spots without a microscope. These other leaf spot problems are currently widespread due to the wet weather. It can follow water patterns because of its prolific spore production.
Control is similar to dollar spot.
It does not produce the typical greasy spots of Fusarium patch. It is most common on velvet bentgrass in coastal areas. This is an official page of the University of Massachusetts Amherst Campus.