Unlike most “what’s up with my coneflowers?” posts this is in fact aster yellows. Unfortunately you need to pull the affected plant and dispose of it somewhere insects cannot feed on the affected tissues.
KateBlankett
I’m so sorry. This is aster yellows.
cheapandbrittle
Can mods pin this post of REAL asters yellow? lol
_Rumpertumskin_
Arrrg it looks so cool though that sucks it’s a disease.
harrietlane
“Aster yellows is a plant disease that can infect many plants.
Infected plants have yellow leaves and stems, stunted growth and small malformed flowers.
The disease is caused by a phytoplasma (small bacterium).
The pathogen can live only within the vascular system of a plant or within the leafhopper that brings it from plant to plant.
The aster yellows phytoplasma moves systemically through the plant, infecting every part from the roots through the flowers. The pathogen affects the plant’s growth, development, and ability to store nutrients.
The aster yellows phytoplasma will not survive in the debris of infected plants but can survive in the crown and roots of infected perennial plants.
Plants infected early in the growing season may remain small and stunted.
Leaves are discolored from pale green to yellow or white. In some plants, red to purple discoloration of leaves occurs. You may notice many thin, weak stems grow close together forming a “witches’ broom.”
Flowers are small, malformed, and often remain green or fail to develop the proper color.”
This post is proof that aster yellow fear is pretty much just hysteria. 99% of posts asking if their plants have it are just being paranoid, and the one who *does* have it is unaware of what it even is!
Good luck OP, I hope you’re able to keep it under control. I thankfully caught a case of this early last year and it shows no indications of spread this year!
MrsMonovarian
This post me realize I have a coneflower with asters yellow that will be removed tomorrow. How worried should I be about the coneflowers around it? Would it take another growing season for symptoms to show?
ckskrr
Never heard of ‘aster yellow’ but that’s beside the point. Isn’t this just one of the new cultivars of coneflower?
Actually looks kind of cool even though it’s a disease. I thought this was a cultivar at first.
ExtensionViolinist97
This thread has been very informative! I never heard of aster yellows. Not sure I’ve ever seen a leaf hopper. I’m in PA where we have Chinese lantern flies. The lantern flies eat all kinds of garden pests: aphids, Japanese beetles, slugs, mites. If I had leaf hoppers, the lantern flies ate ’em.
10 Comments
Unlike most “what’s up with my coneflowers?” posts this is in fact aster yellows. Unfortunately you need to pull the affected plant and dispose of it somewhere insects cannot feed on the affected tissues.
I’m so sorry. This is aster yellows.
Can mods pin this post of REAL asters yellow? lol
Arrrg it looks so cool though that sucks it’s a disease.
“Aster yellows is a plant disease that can infect many plants.
Infected plants have yellow leaves and stems, stunted growth and small malformed flowers.
The disease is caused by a phytoplasma (small bacterium).
The pathogen can live only within the vascular system of a plant or within the leafhopper that brings it from plant to plant.
The aster yellows phytoplasma moves systemically through the plant, infecting every part from the roots through the flowers. The pathogen affects the plant’s growth, development, and ability to store nutrients.
The aster yellows phytoplasma will not survive in the debris of infected plants but can survive in the crown and roots of infected perennial plants.
Plants infected early in the growing season may remain small and stunted.
Leaves are discolored from pale green to yellow or white. In some plants, red to purple discoloration of leaves occurs. You may notice many thin, weak stems grow close together forming a “witches’ broom.”
Flowers are small, malformed, and often remain green or fail to develop the proper color.”
[source: uni of Minnesota](https://extension.umn.edu/plant-diseases/aster-yellows)
This post is proof that aster yellow fear is pretty much just hysteria. 99% of posts asking if their plants have it are just being paranoid, and the one who *does* have it is unaware of what it even is!
Good luck OP, I hope you’re able to keep it under control. I thankfully caught a case of this early last year and it shows no indications of spread this year!
This post me realize I have a coneflower with asters yellow that will be removed tomorrow. How worried should I be about the coneflowers around it? Would it take another growing season for symptoms to show?
Never heard of ‘aster yellow’ but that’s beside the point. Isn’t this just one of the new cultivars of coneflower?
https://duckduckgo.com/?q=coneflower&t=iphone&ia=images&iax=images&iai=https%3A%2F%2Fcdn.pixabay.com%2Fphoto%2F2017%2F05%2F03%2F16%2F31%2Fsummer-2281487_1280.jpg
Actually looks kind of cool even though it’s a disease. I thought this was a cultivar at first.
This thread has been very informative! I never heard of aster yellows. Not sure I’ve ever seen a leaf hopper. I’m in PA where we have Chinese lantern flies. The lantern flies eat all kinds of garden pests: aphids, Japanese beetles, slugs, mites. If I had leaf hoppers, the lantern flies ate ’em.