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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]
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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).
Under severe infection, lesions enlarge and become coalesced causing blighting of the leaves. This symptom progression occurred in research done in Pakistan: the symptoms on affected tomatoes started with yellowing and browning of the lower leaves, then began developing on the leaf tips and along the margins of the leaf petiole.
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 ...
Bacterial spot: Xanthomonas campestris pv. vesicatoria: Bacterial stem rot and fruit rot Erwinia carotovora subsp. carotovora: Bacterial wilt: Ralstonia solanacearum: Pith necrosis Pseudomonas corrugata: Syringae leaf spot Pseudomonas syringae pv. syringae: Aster yellows Ca. Phytoplasma asteris Tomato big bud Ca. Phytoplasma sp.; may be ...