Pseudomonas tolaasii is a species of Gram-negative soil bacteria that is the causal agent of bacterial blotch on cultivated mushrooms (Agaricus bisporus).

[1] It is known to produce a toxin, called tolaasin, which is responsible for the brown blotches associated with the disease.

[2] It also demonstrates hemolytic activity, causing lysis of erythrocytes.

[3] Based on 16S rRNA analysis, P. tolaasii has been placed in the P. fluorescens group.

This Pseudomonadales article is a stub.