Pests and Diseases forum: Is This Aster Yellows?

Views: 118, Replies: 6 » Jump to the end
Name: Karen
Southeast PA (Zone 6b)
Celebrating Gardening: 2015
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kousa
Aug 8, 2016 6:52 PM CST
Found these deformed flowers on my perennial sunflower shrub. Are these deformities resulted from aster yellows virus?


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Name: Sue
Ontario, Canada (Zone 4a)
Daylilies Birds Enjoys or suffers cold winters Native Plants and Wildflowers Butterflies Annuals
Region: Canadian Keeps Horses Dog Lover Plant Identifier Garden Sages
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sooby
Aug 10, 2016 5:55 AM CST
Do you know which Helianthus it is? Some are listed as susceptible so it could be a possibility but it would be more definitive if we had the species name. Do you see any flowers that are worse, like with short rays and mostly green?
Name: Karen
Southeast PA (Zone 6b)
Celebrating Gardening: 2015
Image
kousa
Aug 10, 2016 8:05 AM CST
@sooby, Hi Sue! There is no green on the flowers, just these uneven pop ups of yellows. I bought this at a Farmer's stand so it does not have a name. I guess the person who sold these at the stand grew them in their home garden.
Name: Sue
Ontario, Canada (Zone 4a)
Daylilies Birds Enjoys or suffers cold winters Native Plants and Wildflowers Butterflies Annuals
Region: Canadian Keeps Horses Dog Lover Plant Identifier Garden Sages
Image
sooby
Aug 10, 2016 8:27 AM CST
Are there any leaf symptoms, like yellowing, smaller leaves, curling leaves Karen? Have you seen any leafhoppers on them?
Name: Karen
Southeast PA (Zone 6b)
Celebrating Gardening: 2015
Image
kousa
Aug 10, 2016 10:29 AM CST
Other than the unusual flower forms, the shrub is healthy. There is no yellowing or curling leaves. I don't know about leafhoppers but I have seen grasshoppers in the bed.
Name: Sue
Ontario, Canada (Zone 4a)
Daylilies Birds Enjoys or suffers cold winters Native Plants and Wildflowers Butterflies Annuals
Region: Canadian Keeps Horses Dog Lover Plant Identifier Garden Sages
Image
sooby
Aug 10, 2016 10:49 AM CST
Aster yellows is caused by a phytoplasma, a kind of bacteria, that is transmitted by leafhoppers which is why I asked about them. If there are no other symptoms and no sign of leafhoppers I might just keep an eye on the plants. Do you have any other plants susceptible to aster yellows?
Name: Karen
Southeast PA (Zone 6b)
Celebrating Gardening: 2015
Image
kousa
Aug 10, 2016 10:59 AM CST
Thank you so much, Sue! I will keep an eye on it. I do have coneflowers, asters, and mums that are susceptible to aster yellows. As soon as I see any green growths or yellowing of leaves, I will remove it.

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