Ralstonia pseudosolanacearum

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Ralstonia pseudosolanacearum - rose plants in different stages of disease development - A) no symptoms, B) initial symptoms, C) advanced symptoms, D) plant death (click on image to enlarge it)
Authors: Tjou-Tam-Sin et al.
Source: Frontiers in Plant Science (2017) 8, 1895

Ralstonia pseudosolanacearum Safni et al., 2014

The bacterium is widely distributed and causes bacterial wilt on solanaceous and other crops. Before 2014, the strains have been assigned to Ralstonia solanacearum phylotype I and III (see Safni et al., 2014). The symptoms are similar to those of R. solanacearum and apart from wilting include vascular necrosis and bacterial streaming or ooze from a cut stem sections. Potato tubers show internal browning.

Since 2015, rose plants in the Netherlands have been affected by a strain of R. pseudosolanacearum that causes an unusual disease. Initially, young shoots and flower stalks wilt, followed by chlorosis of the leaves, stunting, and dieback with black necrosis of pruned branches. The disease incidence can reach 50% (e.g. see Bergsma-Vlami et al., 2018).