Brown spots on your mushrooms
Brown to yellowish-brown, sometimes shiny spots on the caps of your button mushrooms are often bacterial blotch (Pseudomonas). They appear when water stays on the cap too long. Mist the air instead of the caps and ventilate better.
Agriculture and Horticulture Development Board (AHDB, VK) · BP-02Humidity that is too high with too little air movement, or spraying the mushrooms directly, leaves a film of water in which the bacteria multiply.
Agriculture and Horticulture Development Board (AHDB, VK) · BP-02Bacteria or bruising?
A bruise only appears after touching or harvesting and stays dry. Bacterial spots already appear during growth and often look moist or shiny.
Agriculture and Horticulture Development Board (AHDB, VK) · BP-02What do you do?
Do not spray the mushrooms themselves; mist the surroundings instead. Ventilate so that water on the caps dries within a few hours. With light spots, cut away the affected cap and use the rest, always well cooked.
Agriculture and Horticulture Development Board (AHDB, VK) · BP-02Voedingscentrum · BO-02When to throw it away?
If a spot is wet, soft or slimy, or smells unpleasant, throw it away: that points to further rot.
Agriculture and Horticulture Development Board (AHDB, VK) · BP-02Source
- Kan je champignons/paddenstoelen rauw eten? — Voedingscentrum
- Identification and control of bacterial blotch on mushrooms — Agriculture and Horticulture Development Board (AHDB, VK)
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This is general growing information from the sources listed. Always follow the instructions of your kit or supplier. Only eat what demonstrably grows from your own culture of the bought, named species; if in doubt about colour, smell or shape, do not eat it.
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