New York Flora Association Blog

Recently there have been outbreaks in the Northeast of a potentially devastating disease on garden impatiens (Impatiens walleriana), a downy mildew caused by Plasmopara obducens.  Cornell Cooperative Extension is looking for help in determining whether this downy mildew is currently affecting native jewelweeds. The New Guinea impatiens (I. hawkeri) does not seem to be affected.  For more info on the disease CLICK HERE.  For more information on what to look for CLICK HERE. If you find what you think is the mildew, collect a sample of the leaves in a clean plastic bag with a moist paper towel, seal it, and mail to:

Margaret Daughtry, Cornell University-LIHREC, 3059 Sound Ave., Riverhead, NY 11901.

This shows what happens to garden impatiens with the mildew.

This entry was posted on June 7, 2012 at 1:42 pm and is filed under Invasive Species, Plant Pathology. You can subscribe via RSS 2.0 feed to this post's comments. You can comment below, or link to this permanent URL from your own site.