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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.
Xanthomonas campestris pv. raphani is a gram-negative, obligate aerobic bacterium that like many other Xanthomonas spp. bacteria has been found associated with plants. This organism is closely related with Xanthomonas campestris pv. campestris, but causes a non-vascular leaf spot disease that is clearly distinct from black rot of brassicas.
Xanthomonas pv. raphani has been found to enter the plant through its stomata to cause infection of the tissue, or rather parenchyma. This results in bacterial spot on a wider range of hosts, which includes both crucifers and certain solanaceous plants. [1] [8] [9]
Xanthomonas (from greek: xanthos – "yellow"; monas – "entity") is a genus of bacteria, many of which cause plant diseases. [1] There are at least 27 plant associated Xanthomonas spp., that all together infect at least 400 plant species. Different species typically have specific host and/or tissue range and colonization strategies.
Under humid conditions, bacteria present in guttation droplets can be spread by wind, rain, water splashes, and mechanical equipment to neighboring plants. [1] [6] The natural route of invasion by Xcc is through the hydathodes, though leaf wounds caused by insects and plant roots may also be portals of entry. [1]
Angular Leaf Spot is currently an issue in strawberry nursery production, leading to problems in transporting strawberry plants throughout the U.S and over to Europe. [5] Xanthomonas fragariae is not only an issue transporting young plants, but infected fruits can lead to a symptom known as “black cap” that can reduce the quality and ...
Bacterial leaf scorch (commonly abbreviated BLS, also called bacterial leaf spot) is a disease state affecting many crops, caused mainly by the xylem-plugging bacterium Xylella fastidiosa. [1] It can be mistaken for ordinary leaf scorch caused by cultural practices such as over-fertilization.
Xanthomonas axonopodis pv. citri overseason in an infected area which appears as a canker lesion on leaf or stem. Canker lesions start out as pinpoint spots 2 to 10 millimeters in diameter. [1] The bacteria ooze out of the lesions when there is free moisture. During rainy weather, wind-blown rain carries the inoculum to new susceptible hosts.
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