Aster Yellows disease in Cone flowers - Ask Extension
Hello, I have had a stand of Coneflowers for many years. Just this year I have noted changes in the seed head of many of the flowers. Could this be ...
Knowledgebase
Aster Yellows disease in Cone flowers #847377
Asked August 26, 2023, 11:57 AM EDT
Hello, I have had a stand of Coneflowers for many years. Just this year I have noted changes in the seed head of many of the flowers. Could this be early Aster Yellows .
Oakland County Michigan
Expert Response
Hello,
Coneflowers are susceptible to attack by a disease called aster yellows and a mite, the eriophyid mite. The damage caused to the plant by both seems to be similar. Read about this problem here: https://bygl.osu.edu/node/1845#:~:text=The%20coneflower%20rosette%20mites%20live,the%20wind%20or%20by%20animals.
For a definitive diagnosis, submit pictures and a sample to MSU Extension’s Plant and Pest Diagnostic Lab at: https://www.canr.msu.edu/pestid/
Thank you for contacting Ask Extension.
Hi thanks for getting back to me. I had tried to attach photos but perhaps you did not get them. I’ve attached photos to this email in case it clarifies mite vs aster yellows. Thank you, Terese
Hello,
I did receive the photos but I was unable to determine what was causing the problem. That's why I referred you to the Diagnostic Lab where analysis is carried out to determine the cause.
Perhaps it is a moot point. In both cases the best treatment is to remove the plants. Read more here: https://hortnews.extension.iastate.edu/aster-yellows#:~:text=of%20aster%20yellows-,No%20treatment%20is%20available%20to%20save%20a%20plant%20infected%20with,feasible%20in%20a%20home%20garden.
And here: https://northerngardener.org/aster-yellows-vs-eriophyid-mites-on-coneflower/#:~:text=To%20treat%20for%20eriophyid%20mites,the%20garden%20well%20come%20fall.
Thank you for contacting Ask Extension.
I did receive the photos but I was unable to determine what was causing the problem. That's why I referred you to the Diagnostic Lab where analysis is carried out to determine the cause.
Perhaps it is a moot point. In both cases the best treatment is to remove the plants. Read more here: https://hortnews.extension.iastate.edu/aster-yellows#:~:text=of%20aster%20yellows-,No%20treatment%20is%20available%20to%20save%20a%20plant%20infected%20with,feasible%20in%20a%20home%20garden.
And here: https://northerngardener.org/aster-yellows-vs-eriophyid-mites-on-coneflower/#:~:text=To%20treat%20for%20eriophyid%20mites,the%20garden%20well%20come%20fall.
Thank you for contacting Ask Extension.
