Here are  some organic solutions for rust and mildew on Zinnia elegans that you can try:

- Use organic protectant fungicides.
- Treat the seeds by placing them in hot water at 125 degrees F for 30 minutes before planting.
- Do not use overhead irrigation. Water at the base of plants.
- Use garlic and jojoba extracts under field conditions as seed treatment at the concentration 3%.

I hope this helps!
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