The beds in downtown Camden which were affected by Downy Mildew have been replanted and will look beautiful this fall. A few last words on Downy Mildew. The mildew first appears on the undersides of the leaves, which is why it takes a while to discover it, by which time the fungal disease has had a chance to progress. In addition to the white undersides to the leaves, the disease symptoms eventually include leaf and flower drop and plant collapse. There is lots of information on the internet. Hopefully, our summer next year will be less humid. Thanks to our civic chairman for being observant and quick to rectify the situation.
This link has some clearer photos (Cornell Extension): http://ccesuffolk.org/assets/Horticulture-Leaflets/Impatiens-downy-mildew.pdf
This has FAQs for landscapers from Ball Horticultural Co.: http://www.ballhort.com/Landscapers/tips.aspx?articleid=16#article