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

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/...

Lin it surely does. Ugghh....ill have to toss hundreds of seeds that I have already saved. Thank you for your help.

Terri, you could try spraying with a fungicide? I found these two pages with information on control:
http://www.missouribotanicalga...
https://extension.umd.edu/ipm/...

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.

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.