Coneflowers, in general, are pest and disease-resistant,' Nicole says. However, 'they can occasionally be attacked by Japanese Beetles, black spot, or powdery mildew, but the plant isn't likely to ...

Cut off the infested blooms to break the cycle. If the central cones of your coneflowers appear black or muddy, sunflower moths (Homoeosoma electellum) might be the likely culprits. These silvery ...