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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 tomato leaf mold fungus is a specific pathogen that only infects tomatoes, mainly in greenhouses. The symptoms of this disease commonly occurs on foliage, and it develops on both sides of the leaf on the adaxial and abaxial surface. The older leaves are infected first and then the disease moves up towards young leaves. [2]
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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 ...
Phomopsis cane and leaf spot is a disease that causes symptoms in the common grapevine species, Vitis vinifera, in many regions of the world. [2] This disease is mainly caused by the fungal pathogen, Phomopsis viticola, and is known to affect many cultivars of table grapes, such as Thompson Seedless, Red Globe, and Flame Seedless. [3]
Alternaria alternata is a fungus causing leaf spots, rots, and blights on many plant parts, and other diseases. It is an opportunistic [ citation needed ] pathogen on over 380 host species of plant. It can also cause upper respiratory tract infections [ 1 ] and asthma in humans with compromised immunity.