Clavibacter insidiosus

Clavibacter • plant pathogenic bacteria • plant diseases • pests-diseases-weeds

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alfalfa stem infected by Clavibacter_insidiosus - left inner symptoms, right symptoms on inner bark (click on image to enlarge it)
Author(s): American Phytopathological Society
Source: Images

cross-sections of alfalfa roots - infected by Clavibacter_insidiosus (centre and left) - right = healthy root (click on image to enlarge it)
Author(s): American Phytopathological Society
Source: IPM Images

Clavibacter insidiosus (McCulloch 1925) Li et al. 2018 - (bacterial wilt of alfalfa)

This bacterium is causing a wilt disease of alfalfa or lucerne (Medicago sativa). It is mainly a serious pathogen in North America, but has been also reported from other regions, including sporadically from Europe before the 1980s. The bacteria enter the plant through small wounds and spread between plants by water, soil particles and agricultural equipment. The pathogen can persist in plant debris and seeds for several years.

Disease symptoms include stunting, leaf mottling, and severely infected plants wilt. Internally, infected plants show a yellow-brown ring in cross-sections of the taproot. The stem shows vascular discoloration.

Synonyms:
Clavibacter michiganensis subsp. insidiosus

For a review see EPPO Bulletin (2022).