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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 solution: You can remove old, yellow peace lily leaves with scissors or by pinching them off the plant with your fingers. This improves the look of your peace lily and redirects the plant’s ...
Black spot (class Leotiomycetes: family Helotiales) Diplocarpon rosae syn. Marssonina rosae – Marssonina rosae causes black spots on leaves. [4] The spots, which may be as much as 12 mm across, are generally circular and have an irregular edge often with a yellow halo. Leaves frequently turn yellow and fall early.
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 ...
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 ...