the National Fruit Collection identify four separate viruses which can obliterate grape crops . Experts say the only way to deal with problem is to pull up plants . Disease spotted on vines at the National Fruit Collection gardens in Wisley , Surrey . Also found at RHS in Brogdale , Kent . Can result in reduced yields , delayed fruit ripening and overly-acidic grapes .
RHS identify four separate viruses which can obliterate grape crops . Experts say the only way to deal with problem is to pull up plants . Disease spotted on vines at RHS gardens in Wisley , Surrey . Also found at the National Fruit Collection in Brogdale , Kent . Can result in reduced yields , delayed fruit ripening and overly-acidic grapes .