Annuals forum→Problems with my Zinnias

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May 7, 2020 5:21 PM CST
Good Evening,

My zinnias usually do pretty well every year. This year they seem to be infected with a fungus or something. Can anyone tell by looking at these pictures what's wrong with them?
Thumb of 2020-05-07/DT712/a88675

Thumb of 2020-05-07/DT712/410113

Name: ZenMan
rural Kansas (Zone 5b)
Kansas 5b
Annuals Seed Starter Keeper of Poultry Enjoys or suffers cold winters Dragonflies Garden Photography
Hybridizer Region: United States of America Hummingbirder Butterflies Zinnias Garden Ideas: Level 2
May 8, 2020 9:15 AM CST
Hello DT712, Welcome!
Welcome to the National Gardening Association forums.

I think the zinnias in your photos are too far gone to save. They most probably are infected with two different fungus diseases, Alternaria Blight and Cercosperia Leaf Spot. The common Powdery Mildew of zinnias is not strongly indicated in your photos.

There could be some Bacterial Leaf Spot present, but nothing positive for that appears in your photos. Since there is no "cure" for Bacterial Leaf Spot (other than prevention by sanitary practices) let's assume you have "just" the two fungal diseases on your zinnias.

You can prevent zinnia fungal diseases by spraying them with a good fungicide. Prevention is a better strategy than cure. I prefer to use a systemic version of fungicide, which is absorbed into the plant sap, travels throughout the plant, and protects for several weeks from one application. But frequent applications of a non-systemic (like Green Cure, which is based on Potassium bicarbonate and a good wetting agent) can also do the trick. You just need to apply it more frequently.

But, like I said, these zinnias in the photos are too far gone to save. It is interesting that there is a black "mulch" or "compost" material present in your photos. I frequently see that black stuff in photos of zinnia plant disease problems. It is a frequent source of plant disease infections. In your first photo the black stuff appears to be heaped up around the plant, partially burying the plant. Why was that done?

I tip my hat to you.

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