Over the last two years I planted borders of Zinnia profusion backed by Dahlia Tahoma Hope backed by assorted Bee Balm. It’s been a beautiful long season show but this year Sclerotinia has fairly decimated the zinnia beds. I determined Sclerotinia with the help of plant expert from Shorty’s Nursery. The fungus was in one border until August but now showing up in additional borders that form a half circle at the gardens entrance. Info on treatment is sporadic at best. I’m only finding Wikipedia’s take on the topic with a nod towards fungicide without directions on application. I’d appreciate any ideas. The garden has a historically limited pallete of plants. The color parade has been outstanding so of course we’d like to continue with Zinnias. No other plants in these borders seem to be affected. Thank you, Robb Rosser email@example.com 503-381-3576
Clark County Washington
FIrst of all, I would suggest that the diagnosis may be incorrect. My suggestion to you would be to take a sample of the plant--pull up an entire plant, preferably, and take it into the Clark County Master Gardener Plant Clinic. They can take a look at it, and if necessary, can send it to our WSU plant pathologist in Puyallup for a definitive diagnosis.
Call (564) 397-5711Heritage Farm/WSU Extension Plant Clinic Office1919 NE 78th Street, Vancouver, Washington.Hours for walk-in clients:Tuesday and Wednesday • 10 A.M. to 2 P.M.Thursday and Friday • 11:30 A.M. to 3 P.M.
- Make sure the plants have good air circulation because crowding creates a good environment for fungal disease.
- Remove and destroy all the affected zinnias.
- Rotate your flower crop for 3 full years with plants that are less susceptable to the disease, such as alyssum, daffodil, salvia, pansies, or ornamental grasses.