Bacteria

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Xanthomonas axonopodis pv. citri negatively stained (click on image to enlarge it)
Source: Florida Department of Agriculture and Consumer Services - IPM Images

Bacteria (plant diseases)

Bacteria are small (typically up to 2 µm), single-celled organisms without nucleus but with a cell wall. Many species are mobile by using flagellae. Plant pathogenic species do not form spores and live saphrophytically in the plant host without invading the cells. However, they often produce enzymes which break down the cell wall of the host plant.

Note:
This page only deals with plant pathogenic bacteria. For other groups of bacteria see

The following genera and individual species are currently entered under "bacteria":