Mites or Aster Yellows? - Ask Extension
Hello! I noticed my cultivar Magnus Purple Coneflower is looking odd this season. Part of it is spindly and half of the blooms are all green. Does thi...
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Mites or Aster Yellows? #876975
Asked July 12, 2024, 12:40 PM EDT
Hello! I noticed my cultivar Magnus Purple Coneflower is looking odd this season. Part of it is spindly and half of the blooms are all green. Does this seem like mites or aster yellows? Wondering if it's best to remove the whole plant or just cut away the affected areas. Thank you!
Clay County Minnesota
Expert Response
Good Morning Laura,
Thank you for contacting the U of M Extension Service.
From viewing your photos, it does appear to be aster yellows: https://extension.umn.edu/plant-diseases/aster-yellows
Above is a link about aster yellows.
Here is another link about spider mites: https://extension.umn.edu/yard-and-garden-insects/spider-mites
Good Luck!
Do I need to wait to replant in the same spot once the infected plant is removed?
Laura,
If you read through the information on the weblink it states:
Cultural controls
- Completely remove infected plants from the garden. Once a plant is infected with aster yellows, there is no way to cure it. This can be difficult but is a necessary step to saving other susceptible plants from becoming infected.
- Because aster yellows does not survive in dead plant tissue, there are a couple of disposal options for infected plants.
You should remove the plant and the roots. Read the cultural controls section. You should be able to plant another plant in the same area.
Good Luck!
Thank you!
You are welcome!
