Downy Mildew disease has been widespread in 2011, and my normal bedding busy Lizzies have been infected and died.
However, the larger flowers New Guinea Impatiens do not get this disease, and I don’t think the varieties called SunPatiens get downy mildew either.
Otherwise, looking ahead to 2012 I’d recommend people grow something different.
The Busy Lizzy market is said to be valued at around £25million, so the loss of this market could have a big impact. However, most gardeners and parks departments will grow an alternative, so perhaps this won’t have too much impact on commercial growers.