A colleague in South Carolina recently reported that downy mildew had been observed on yellow summer squash and zucchini plants in a Home Depot in Charleston last week (April 6). The plants had been grown in Miami, FL and had Home Depot tags on them. If you have time, please check out your local Home Depot for this disease. We typically don’t see it until late June or July, and it tends to be more of a problem later in the summer, but if it get started early, it can be extremely difficult to control as the better fungicides for controlling this aren’t readily available in Louisiana. For more information on this disease, please see the Louisiana Plant Pathology fact sheet at http://tinyurl.com/3xapmrd.
Donald M. Ferrin, Ph.D., Louisiana State University Agricultural Center, Baton Rouge, LA