Pseudomonas tolaasii

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Pleurotus ostreatus mushrooms infected by Pseudomonas tolaasii (right) and uninfected (left)
Author(s): Lin-Lin Mu et al.
Source: Journal of Applied Biological Chemistry (2015), 58, p. 352

Pseudomonas tolaasii Paine 1919 - (bacterial blotch of mushrooms)

This bacterium is widely distributed and causes bacterial blotch of commercially grown mushrooms like Agaricus species. Initially, small, irregular, yellow spots appear on the mushroom caps which become darker and often include pitting of the surface. Progress of the disease in the culture depends on environmental conditions like humidity and temperature. Infected mushrooms have a low quality and may be unmarketable.

Management involves maintaining the mushroom culture under the right humidity and temperature conditions in order to avoid condensation of water on the caps. In addition, periodically cleaning and disinfecting the culture facility is regarded as important. Research on developing resistant mushroom cultivars as well as biological control methods with antagonistic bacteria is in progress.

For a review see Osdaghi et al. (2019).