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Bacterial diseases (including phytoplasma) Bacterial Canker of Tomato: Clavibacter michiganensis subsp. michiganensis: Bacterial speck: Pseudomonas syringae pv. tomato: Bacterial spot: Xanthomonas campestris pv. vesicatoria: Bacterial stem rot and fruit rot Erwinia carotovora subsp. carotovora: Bacterial wilt: Ralstonia solanacearum: Pith ...
The leaves may also take on a bronze cast [24] along with stems becoming streaked and tuber eyes becoming discolored. Tubers also start to rot if left in the ground. A milky-white sticky exudate or ooze, consisting of bacterial cells and their extracellular polysaccharide, is usually noticeable in freshly cut-sections of infected tubers. [25]
Bacterial soft rot on taro (Colocasia esculenta) Bacterial soft rots are caused by several types of bacteria, but most commonly by species of gram-negative bacteria, Erwinia, Pectobacterium, and Pseudomonas. It is a destructive disease of fruits, vegetables, and ornamentals found worldwide, and affects genera from nearly all the plant families.
Alternaria solani is a fungal pathogen that produces a disease in tomato and potato plants called early blight. The pathogen produces distinctive "bullseye" patterned leaf spots and can also cause stem lesions and fruit rot on tomato and tuber blight on potato. Despite the name "early", foliar symptoms usually occur on older leaves. [3]
The risk of spreading the bacteria to healthy tomato plants is greatest during transplanting, tying, and suckering or any time when the host may be wounded. Once the bacteria enters the plant through a wound, it will move and multiply primarily in the xylem vessels. Once established, the bacteria may move into the phloem, pith, and cortex. [9]
Symptoms of bacterial crown rot begin as angular water-soaked lesions on leaf surfaces and eventually spread through veins and petioles to cause death to the canopy layer of leaves. Water-soaked cankers also appear on the stem, causing it to collapse, and spread to meristems, killing the growing tips of the plant (Webb 1985; Fullerton et al ...
The bacteria progress through the vascular system to the young stems and leaves, where the disease manifests as V-shaped chlorotic to necrotic lesions extending from the leaf margins. Under humid conditions, bacteria present in guttation droplets can be spread by wind, rain, water splashes, and mechanical equipment to neighboring plants.
Xanthomonas campestris pv.vesicatoria is a bacterium that causes bacterial leaf spot (BLS) on peppers and tomatoes. It is a gram-negative and rod-shaped. [1] It causes symptoms throughout the above-ground portion of the plant including leaf spots, fruit spots and stem cankers.