Endophytes of meadow fescue.
Of 2 endophytes identified in meadow fescue (Festuca pratensis) in Switzerland (Acremonium uncinatum and A. typhinum), only A. uncinatum was found in breeding families, the Czech cultivar Otava and the Dutch cultivar Barpresto. A positive correlation was noticed between the presence of A. uncinatum and plant resistance to Rhopalosiphum padi and Tetraneura ulmi. Under artificial inoculation conditions in the greenhouse and in the field, A. uncinatum induced resistance to Drechslera sorokiniana [Cochliobolus sativus]. Both endophytes showed antifungal activity in vitro against most of the potential pathogens tested, but A. typhinum was more effective. Seedling vigour and development were decreased by the endophytes in the greenhouse. But in nurseries under field conditions, A. uncinatum resulted in better survival of plants and increased vigour.