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Aster yellows on coneflower

By: Garden Gate staff
One disease that can infect purple coneflower is aster yellows. It’s caused by a phytoplasma, a disease-causing organism smaller than bacteria but larger than a virus.

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Aster yellows on coneflower

IDENTIFICATION — One disease that can infect purple coneflower is aster yellows. It’s caused by a phytoplasma, a disease-causing organism smaller than bacteria but larger than a virus.

DAMAGE — Leafhoppers carry the disease by piercing leaves to feed on plant juices. Infected plants produce underdeveloped and deformed flowers, as shown in the photo.

CONTROL — There’s no cure, but you can stop the spread of the disease by pulling up all infected plants and destroying them. The phytoplasma needs a living host, so skip a season after the cleanup before planting more coneflowers.

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