Sounds like the impatiens fungal disease that has been sweeping the country. Some nurseries even decided not to sell impatiens this spring just because of this disease. I do think some disease resistant varieties will be ready by next spring but nobody knows for sure. Be sure to ask your local nursery for the latest update and if you are concerned substitute was begonias or another shade-loving annual instead of the disease prone impatiens. Keep growing, Marianne Binetti