Exchanging Knowledge with Cooperative Extension

Melanie Lewis Ivey  |  8/21/2014 6:38:21 PM

Photo courtesy of Francesca Petuda-Hand (The Ohio State University).

Photo By: West, Lisa

Photo courtesy of Allen Owings (LSU AgCenter).

Photo By: West, Lisa

Extension Spotlight

On your next visit to your local garden center you may find yourself asking "Where have all the Impatiens gone?” The answer is, they have succumbed to a plant disease called Impatiens Downy Mildew. This disease is fatal to standard and double impatiens and is very difficult to manage, but not impossible. Through the use of an integrated disease management program, disease severity and incidence can be reduced.

The keys to success are early detection and accurate disease diagnosis, good sanitation and water management practices, and selection and application of effective chemicals. You can also plant other colorful bedding plants such as New Guinea impatiens, begonias and pentas. For more information on impatiens downy mildew or suitable plant alternatives, contact your local parish horticulture crop specialist.


 

Cucurbit and Basil Downy Mildew National Monitoring Program

Agents, if you suspect that a grower has basil downy mildew or cucurbit downy mildew, please contact Dr. Melanie Lewis Ivey either by email or phone (225-578-8537). Basil and cucurbit samples can be sent to me for free. All other plant samples should be sent to the Plant Diagnostic Center. Once the disease has been confirmed using microscopy, the disease occurrence will be reported to the respective national databases. These databases are used to monitor the movement of the pathogens across the United States, which allows for the rapid implementation of a preventative spray program. The data is also being used to develop a forecasting system for cucurbit downy mildew.

Plant Disease and Management Resources

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