Epichloe typhina galls the stems of various grasses, the gall often having a rather tubular appearance. It is white in the early stages, yellowing when mature. On various grasses including many of our most common species including Sweet Vernal-grass, False Oat-grass, Cock's-foot, Perennial Rye-grass, Wood Millet, Timothy and Rough Meadow-grass.

There are several other Epichloe species that affect different species of grass and have different spore-sizes and characteristics.

host

Please provide photograph of the area affected by 'choke' and an image of the host grass.  Please state the host grass species in the comments section.