Wednesday, February 8, 2012
Impatiens Downy Mildew Report:
Over the past several weeks a disease known as Downy Mildew (Plasmopara obducens) that affects Impatiens (walleriana species -seed types primarily) has become widespread throughout the South Florida Landscape environment. Prior to this outbreak this disease has rarely been found in Florida, or elsewhere in the US, though it has been seen widespread in Europe for years resulting in devastation of Impatiens plantings.
Once the plants are infected there is no known cure, though plants have been able to to be protected prior to infection, by following a stringent fungicide protocol. Proper identification of the disease symptoms is critical for diagnosis, Ppease see link below to identify Downy Mildew. If you suspect that you have Downy Mildew in your landscape, it is probably too late to save them. They will need to be removed as soon as possible following strict disposal methods to prevent further spread of the disease in your landscape.
If you have a symptom free crop in your landscape you must be willing to follow the instructions to maintain a fungus free environment. This is also a time consuming and expensive task. Your professional landscape maintenance personnel should be trained in this application and can be relied upon for combating this aggressive fungus.
The good news is that our crops are fungus free and no Downy Mildew has been identified in our nurseries because of our strict fungus preventative treatments. Further is appears that the the Downy Mildew does not affect any other soft or woody ornamental plants. Also on a good note, it appears that New Guinea impatiens have been spared as the these hardy hybrids seem to be very resistant to the disease, New Guinea impatiens have become the favorite of Landscapers and Gardeners alike.
We will keep you posted as to any developments in the ongoing efforts being made by the Florida Department of Agriculture in combating this fungus.
check out the link below for preventative treatments: