Unusual growth on coneflower - Ask Extension
Hi,Several of my coneflowers have an unusual growth coming out of them. The one in the attached picture is the most prominent of them. Do you know wh...
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Unusual growth on coneflower #843578
Asked July 31, 2023, 10:54 PM EDT
Hi,
Several of my coneflowers have an unusual growth coming out of them. The one in the attached picture is the most prominent of them. Do you know what it is? Is there something I should do about it? Cut the top off? Did up the entire plant? Ignore it?
Thank you very much for your time,
Ben
Jefferson County Colorado
Expert Response
Hi Ben,
This is a disease called "aster yellows", which is a phytoplasma and is moved plant-to-plant via leafhoppers. Is it recommended that you remove the infected plants, since there is no cure once the plant is infected...and it can spread to healthy plants.
Here's a good publication from the University of Wisconsin: https://hort.extension.wisc.edu/articles/aster-yellows/ and from the U of Minnesota: https://extension.umn.edu/plant-diseases/aster-yellows
This is a disease called "aster yellows", which is a phytoplasma and is moved plant-to-plant via leafhoppers. Is it recommended that you remove the infected plants, since there is no cure once the plant is infected...and it can spread to healthy plants.
Here's a good publication from the University of Wisconsin: https://hort.extension.wisc.edu/articles/aster-yellows/ and from the U of Minnesota: https://extension.umn.edu/plant-diseases/aster-yellows
