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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.
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 ...
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 ...
Ramularia leaf spot Ramularia beticola: Rhizoctonia foliar blight, crown and root rot Rhizoctonia solani: Rhizopus root rot Rhizopus arrhizus Rhizopus stolonifer. Rust Uromyces betae: Sclerotinia crown & root rot Sclerotinia sclerotiorum: Seedling rust Puccinia subnitens: Slime molds Physarum cinereum: Southern blight (Sclerotium root rot and ...
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 ...
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 ...
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 ...