Dahlias forum: Disease or normal senescence?

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Name: Carol H. Sandt
Lancaster County, Pennsylvania (Zone 6b)
Peonies Region: Pennsylvania Growing under artificial light Foliage Fan Bookworm Annuals
Roses Hostas Xeriscape Daylilies Aroids Region: Mid-Atlantic
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csandt
Aug 21, 2018 12:51 PM CST
My Dahlia pinnata Dahlietta® Tessy plants have all developed ugly black coalescing leaves lately. Is this disease or something normal, such as end-of-season senescence? Are these tubers worth saving? Affected areas are indicated in yellow:
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Name: Geof
NW Wisconsin (Zone 4b)
Region: Wisconsin Dahlias Garden Ideas: Level 1 Celebrating Gardening: 2015
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mandolls
Aug 21, 2018 3:51 PM CST
It is not typical. I would guess some kind of fungus?

If it is that it wont necessarily effect the tubers, but may overwinter in the soil.
Name: Carol H. Sandt
Lancaster County, Pennsylvania (Zone 6b)
Peonies Region: Pennsylvania Growing under artificial light Foliage Fan Bookworm Annuals
Roses Hostas Xeriscape Daylilies Aroids Region: Mid-Atlantic
Image
csandt
Aug 22, 2018 1:09 PM CST
Thank you, Geof. I removed all three plants to the trash. I hope the fungus is specific for dahlials. So much for growing dahlias! That's enough for me.
Carol

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