What causes hollyhock rust?

Related questions

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2. What is killing my hollyhocks?
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4. Are fuchsias poisonous?
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Tags

1. #hollyhocks
2. #worse
3. #disease
4. #parts
5. #spread
6. #plant
7. #develop
8. #spores
9. #summer
10. #invariably
11. #puccinia
12. #caused
13. #although
14. #airborne
15. #untreated
16. #during
17. #aerial
18. #malvacearum
19. #fungal
20. #weather
21. #hollyhock