Ask a Question forum: What is this on my zinnias?

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Name: Terri Osipov
Rome, Georgia (Zone 7b)
Every day in the yard is a GOOD day
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IJsbrandtGA
Sep 19, 2016 9:15 AM CST
Good morning! Can someone tell me what the spots are on my zinnias? They have been coming back the past 3 years and I worry that the seed must be transmitting whatever it is. Thank you very much. Terri
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Name: Lin
Florida (Zone 9b)
Region: United States of America Morning Glories Region: Florida Houseplants Charter ATP Member I was one of the first 300 contributors to the plant database!
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plantladylin
Sep 19, 2016 9:19 AM CST
I don't know a thing about Zinnia diseases but upon googling, it looks a lot like the fungal infection, Alternaria Leaf Spot: http://www.backyardnature.net/yucatan/leafspot.htm
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Name: Terri Osipov
Rome, Georgia (Zone 7b)
Every day in the yard is a GOOD day
Dog Lover Bee Lover
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IJsbrandtGA
Sep 19, 2016 10:24 AM CST
Lin it surely does. Ugghh....ill have to toss hundreds of seeds that I have already saved. Thank you for your help. Grumbling

Thank You!
"Speak to the Earth and it shall teach Thee" Job 12:8
Name: Lin
Florida (Zone 9b)
Region: United States of America Morning Glories Region: Florida Houseplants Charter ATP Member I was one of the first 300 contributors to the plant database!
Garden Procrastinator Birds Butterflies Bee Lover Hummingbirder Container Gardener
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plantladylin
Sep 19, 2016 10:40 AM CST
Terri, you could try spraying with a fungicide? I found these two pages with information on control:
http://www.missouribotanicalgarden.org/gardens-gardening/you...
https://extension.umd.edu/ipm/commercial-greenhouse-producti...
~ Eat, Sleep .... Play in the dirt ~
Name: Philip Becker
Fresno California (Zone 8a)
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Philipwonel
Sep 19, 2016 1:02 PM CST
Wow ! Im surprised nobody suggested that next spring when your ready to plant.to soak your seeds in some diluted peroxide water or diluted fungacide water for a day.
Maybe treat the soil also.
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Name: Rick Corey
Everett WA 98204 (Zone 8a)
Sunset Zone 5. Koppen Csb. Eco 2f
I helped beta test the first seed swap Plant and/or Seed Trader Seed Starter Region: Pacific Northwest Photo Contest Winner: 2014 Vegetable Grower
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RickCorey
Sep 19, 2016 4:00 PM CST
They look like big, mostly healthy plants with a little leaf damage.

You might reconsider throwing seeds away, if they produce plants that produce blooms, and only look "spotty" later in life.

You might just have plants that take a few insect bites, and then fungus attacks the leaves where they have been punctured.

But it is kind to hold back from trading them around, until you are sure.

Unless all your saved seeds are showing those spots, and no purchased seeds do, the source of the discoloration may be the insects, wind and the soil, or the seeds, or both.

A peroxide soak before sowing or sprouting can't hurt and could help.
Dilute drugstore peroxide by 1:32, like:
1.5 tsp peroxide diluted to 1 cup or
1 ounce peroxide per quart of water.

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