Posted: Oct 10, 2012 9:57 AM
Updated: Oct 10, 2012 9:58 AM
The beautiful bright yellow daisy-like flowers of rudbeckia are often overshadowed by the diseased foliage.
A bacterial and several fungal leaf spot diseases cause purplish-black spots on the leaves of rudbeckia. Severe infestation can totally blacken the leaves and cause the plants to dieback a bit earlier in fall. Fortunately most of the diseases are cosmetic and the plants will continue to flower and return each year.
Reduce the risk of this disease by providing adequate light and air circulation around the plants. Use a soaker hose or watering wand to apply water directly to the soil when needed.
In fall remove and destroy all diseased plant parts.
If disease is a yearly problem you can use a copper containing fungicide as a preventative. Or plant something slightly shorter in front of these plants to mask the discolored leaves but allow the flowers to show through.