Canna Rust
arlenerw
19 years ago
Featured Answer
Sort by:Oldest
Comments (9)
mareas
19 years agoarlenerw
19 years agoRelated Discussions
Recommended antifungal for potted cannas?
Comments (2)One of problems is I could not determine where the canna is growing. This is often important because certain pathogens are more prevalent in specific zones. The necrotic symptoms appear to me to be more closely aligned with a bacteria leaf disease (specifically-bacteria leaf spot). These symptoms could be the result of a virus infection but does not appear to be either CaYMV or CaYSV. Canna rust (fungal) is most prevalent in the Southern areas of the U.S. but can occur further north but most often in late summer and the fall season. Rust always begins on the lower side of the leaf surface with the onset of red postulates. Rust is typically easy to diagnose by observing the underside of the leaf prior to necrosis. If possible, it would be better if your plant received more hours of sun and prevent overhead watering late in the day. Wet foliage for extended time will augment the onset of both bacterial and fungal disease. I cannot personally rule out any of the three possibilities. Kent...See MoreCanna Rust and Overwintering
Comments (1)If you have not already Goggled a search for âÂÂplant rust diseaseâ I would suggest you start there. There is a lot of general information on the web. You should not need to discard your rhizomes but the fungal pathogens will likely persist in the soil. I do not believe the pathogens will seriously impact the dormant rhizomes. Canna rust typically attacks the foliage. You may choose to over-winter the rhizomes in their pots this winter, but I would definitely discard the soil and wash the containers early next spring before dividing and replanting. Under the right conditions, rust pathogens can easily be air transported from outside sources. Prevention is the main consideration. You need to consider the cause of the rust in your canna situation; otherwise you may continue to experience the same occurrence in the coming years. Sanitation and good air circulation for the growing plants should be considered. From your description, I suspect your pots were overcrowded. Potted cannas usually need to be divided each season. Foliage that remains wet in the evening contributes to ideal conditions for canna rust. Only use overhead watering early in the day to allow the foliage to dry. There is not much we can do about prolonged rainy periods but the canna leaves do have a wax like covering that generally aids in preventing prolonged damp foliage; providing there is adequate air circulation. Hope this may be helpful. Regards, Kent...See MoreIS Rust on Cannas the same as Daylily rust?
Comments (1)No, it's a different rust. Ed...See MoreCanna rust + garlic?
Comments (1)From everything I've observed and read, rust is plant specific. Since garlic and canna aren't related, you don't need to worry. In general I find garlic to be quite trouble-free to grow....See Moreaboo0328
19 years agobetinaf
18 years agocantstopgardening
18 years agodebbie8592
18 years agopkmaven
16 years agopkmaven
16 years ago
Related Stories
GARDENING GUIDESGreat Design Plant: Cannas
Easy to grow and maintain, these showy, colorful plants are perfect for beginning gardeners
Full StoryFALL GARDENING7 Reasons Not to Clean Up Your Fall Garden
Before you pluck and rake, consider wildlife, the health of your plants and your own right to relax
Full StoryCOLOROrange in the Garden: Do You Dare?
Tangerine and other oranges are boldly cavorting from fashionable interiors to outdoor rooms. See some in-vogue examples here
Full StoryURBAN GARDENSOnce a Barren Rooftop, Now a Serene City Getaway
An outdoor shower and dining area atop a Manhattan penthouse? Stop rubbing your eyes and start checking it out
Full StorySponsored
canna2grow