Interaction between Acremonium byssoides and Plasmopara viticola in Vitis vinifera

Summary. The endophytic fungus Acremonium byssoides was isolated from the leaves of grapevine cv. Regina Bian- ca to determine whether it could act as an antagonistic endophyte of the downy mildew agent Plasmopara viticola. The occurrence of this fungus was ascertained in 34 grapevines (cultivars Regina Bianca, Catarratto and Insolia) representing all the grapevine plants in an experimental vineyard located