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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.
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]
Rust fungi grow intracellularly, and make spore-producing fruiting bodies within or, more often, on the surfaces of affected plant parts. [3] Some rust species form perennial systemic infections that may cause plant deformities such as growth retardation, witch's broom, stem canker, galls, or hypertrophy of affected plant parts.
The beauty of cut hydrangeas is glorious but fleeting. Find out how to make their blooms last longer indoors.
Infected leaves are filled with numerous black lesions that cover an obvious portion of the leaf. [5] These lesions first appear as small purple spots which turn red to brown and then black. Most spots are circular but can amalgamate to form large, irregular dead patches. [6] These spots tend to enlarge and separate from healthy tissue.
Bacterial leaf spot Pseudomonas cichorii ... Rust Pucciniastrum hydrangeae ... Athelia rolfsii [teleomorph] Viral diseases. Viral diseases; Phyllody Hydrangea ...
Several members of the order Pucciniales are commonly called leaf rusts: . Wheat leaf rust caused by Puccinia triticina; Hemileia vastatrix which causes Coffee leaf rust; Leaf rust (barley) or barley leaf rust or brown rust or barley brown rust...
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