Novel endophytes are naturally occurring fungi selected for special features. It is important to choose the appropriate endophyte for the situation before selecting the ryegrass. Endophyte in ryegrass will be required in most situations.
Most perennial ryegrass plants in New Zealand pastures contain a fungus called endophyte that grows inside the plant and is passed to the next generation via the seed. Endophyte protects the plant from insect attack but can also cause animal health problems.