Pseudomonas syringae pv. syringae

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Pseudomonas syringae pv. syringae on bean plant (click on image to enlarge it)
Author(s): Howard F. Schwartz, Colorado State University
Source: IPM Images

Pseudomonas syringae pv. syringae van Hall 1902

The pathovar causes bacterial blight and canker on Phaseolus bean, stone fruits, pear (blast), persimmon and other crops. The pathogen is widespread in temperate and subtropical regions. The symptoms vary with the host plant. On stone fruits, mainly the stems and branches become infected which can lead to tree death. The bacteria might overwinter epiphytically on buds or in stem cankers and cause blossom blast in spring. It then spreads to branches or stems and enters these through small wounds. Freezing temperatures increase the severity of the disease. Management is difficult. Copper sprays are the standard approach against bacterial diseases, but only work when the pathogen is on the surface. Some limited progress has been made on developing resistant cultivars.

Pseudomonas syringae pv. syringae on bean pod (click on image to enlarge it)
Author(s): Howard F. Schwartz, Colorado State University
Source: IPM Images
Vernacular names
• Deutsch: Bakterienbrand des Zitrus
Bakterienbrand des Steinobsts
Fliederseuche
• English: blast of citrus
brown spot disease of beans
citrus blast
blast of pear
• Español: chancro bacteriano del ciruelo
• Français: bactériose des arbres fruitiers à noyau
taches bactériennes du haricot

The page Pseudomonas syringae gives a general overview of the biology of this bacterium.