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Puccinia thaliae is the causal agent of canna rust, a fungal disease of Canna. Symptoms include yellow to tan spots on the plant's leaves and stems. Initial disease symptoms will result in scattered sori (clustered sporangia), eventually covering the entirety of the leaf with coalescing postulates.
The genus Canna is susceptible to certain plant viruses, which may result in spotted or streaked leaves, in a mild form, but can finally result in stunted growth and twisted and distorted blooms and foliage. Known species of virus are: Canna yellow mottle badnavirus (CYMV) infecting canna species.
Leaf spots can vary in size, shape, and color depending on the age and type of the cause or pathogen. Plants, shrubs and trees are weakened by the spots on the leaves as they reduce available foliar space for photosynthesis. Other forms of leaf spot diseases include leaf rust, downy mildew and blights. [4]
The pathogen causes a disease originally named yellow spot but now commonly called tan spot, yellow leaf spot, yellow leaf blotch or helminthosporiosis. [2] [3] At least eight races of the pathogen are known to occur based on their virulence on a wheat differential set. [4] The tan (yellow) spot fungus was first described by Nisikado in 1923 in ...
Canna 'Bengal Tiger' is an Italian Group canna cultivar with variegated foliage; plant height 190 cm; foliage height 140 cm; upright stems and gently spreading leaves; ovoid foliage, background of green (137A); veins variegated yellow (mostly 13B), but paler in places (13D); maroon edge to leaf; staminodes, labellum and stamen bright orange (28B) blushed a darker, reddish (32A) in places ...
For canna grown outside (in California or Texas, for example), mealybugs and scale insects are most drawn to the dense folds and creases between the leaves and the stem/petiole, where the foliage attaches to the plant. At times, if left unchecked, these sucking-insects may remain effectively concealed in these tight areas, only for older or ...
It has variegated leaves of green with pale yellow variegation parallel to the veins. Nurserymen folk legend has it that in 1923, or thereabouts, a consignment of Canna 'Trinacria' rhizomes was despatched to Siam, now Thailand, from a nursery in California. When it arrived at its destination and was grown out it was found to have variegated ...
Canna 'Roi Humbert' is an Italian Group canna cultivar; bronze foliage, ovoid shaped, spreading habit; oval stems, coloured purple; flowers are cupped, self-coloured scarlet, staminodes are large, edges ruffled, fully self-cleaning; seed is sterile, pollen is sterile; rhizomes are thick, up to 3 cm in diameter, coloured purple; tillering is average.