There was some unusual fungus on the leaves, about 6mm diameter. Have taken affected leaves off and sprayed with organic fungus spray. Only know next year.
Fecha de la experiencia:

Lo vende RHS Plants
Las opiniones que se muestran en esta página proceden de autores de opinión de RHS Plants y Trustpilot no recomienda estas opiniones ni ninguno de los productos.
There was some unusual fungus on the leaves, about 6mm diameter. Have taken affected leaves off and sprayed with organic fungus spray. Only know next year.
The grape vines were well grown and established