 Ripe rot, in particular, seemed to thrive at the higher ultraviolet B (280–320 nm) light exposure that open canopies allow.To compound the potential problem for Hunter Valley wine growers is that, as of 2010, there wasn't any fungicides registered for use for this disease.The unique environmental pressures of the Hunter Valley also conspire to give growers problem with "dieback diseases" that damage the wood parts of the vine and eventually lead to death.