14.7 Endophyte is a fungus Neotyphodiurn lolli, which lives inside ryegrass plants.

It does not spread between plants, but plants grown from endophyte-infected seed will be infected. One of its effects is that it produces a range of compounds that are toxic to Argentine stem weevil Listronotus bonariensis, which feeds on ryegrass. AgResearch New Zealand did a study on the persistence of perennial ryegrass at four rates of Argentine stem weevil infestation. For ryegrass that was infected with endophyte the following data were observed