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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 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 ...
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]
Canna yellow mottle badnavirus (CYMV) infecting canna species. Bean yellow mosaic virus (BYMV) infecting cannas, gladiolus, freesia and many legumes. Tomato aspermy virus (TAV), causes mosaic in cannas, but it has not been reported affecting cannas in the UK. Cucumber mosaic virus (CMV), cannas are susceptible to this virus, but none found yet ...
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 ...
Canna 'Yellow King Humbert' Burbank is a medium sized Italian Group Canna cultivar; foliage green, but often variegated purple markings and occasionally whole leaves purple, oval shaped, spreading habit; oval stems, coloured green + purple; flower clusters are open, spotted, colours yellow with red spots, often large red markings and occasionally whole flowers red, staminodes are large; seed ...
Initial infection occurs on older leaves, with concentric dark brown spots developing mainly in the leaf center. The disease progresses during the period of potato vegetation, and infected leaves turn yellow and either dry out or fall off the stem. On stems, spots are gaunt with no clear contours (as compared to leaf spots).
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 ...