Vegetables Produce Facts English
Recommendations for Maintaining Postharvest Quality
Maturity & Quality
Agaricus bisporus mushrooms (Button Mushrooms) are harvested by maturity and not by size. Maturity is reached when the caps are well- rounded and the partial veil is completely intact. The stipe (stalk) should have a small length to thickness ratio. Stipe length should be sufficient to permit some trimming without cutting flush to the veil.
Good quality, fresh ‘Agaricus' mushrooms should be white to dark brown. White forms are most prevalent. Uniform, well rounded cap with a smooth glossy surface and fully intact veil are indicators of best quality. Stipes are straight and glossy in appearance with an even cut edge. Cleanliness (minimal growth medium residue) and absence of browning or other discoloration are additional quality factors. Visible, open gills and absence of a stipe are negative factors.
Temperature & Controlled Atmosphere
0°C-1.5°C (32°F-35°F) Storage life is typically 5-7 days at 1.5°C (35°F) and 2 days at 4.5°C (40°F).
High relative humidity is essential to prevent desiccation and loss of glossiness. Drying is correlated with blackening of the stipe and gills and curling of the cap. Commonly mushrooms are packed and shipped in cartons with a perforated overwrap to maintain high humidity.
To calculate heat production multiply ml CO2/kg·hr by 440 to get Btu/ton/day or by 122 to get kcal/metric ton/day.
>0.1 µl/kg·hr at 20°C (68°F)
Agaricus mushrooms are not significantly impacted by exogenous ethylene.
Extended storage (~12-15 days) in 3% O2 and 10% CO2 at 0°C has been controlled demonstrated. Elevated CO2 at 10-15% (typically 10%) in air is beneficial in Atmosphere (CA) preventing decay and reducing the rate of blackening of the stipe and gills. The beneficial effect is most pronounced if temperatures cannot be maintained below 5°C (41°F). Short exposure to higher CO2 concentrations (20%) is safe and beneficial only if temperatures can be maintained at 0°C-1°C (32°F-34°F).
Temperature & Controlled Atmosphere Photos
Physiological and Physical Disorders
Use of Materials
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The information in this fact sheet represents our best understanding of the current state of knowledge at the time of the latest update, and does not represent an exhaustive review of all research results. Links to any of these UC Postharvest Technology Center pages are permitted, but no endorsement of the linking site or products mentioned in the linking page is intended or implied by such a link.
How to Cite
Author(s) names. Initial publication or update date (located at the top). Title. Link to the specific Produce Fact Sheet webpage (Accessed date)
Example: Cantwell, M. and T. Suslow. 2002. Lettuce, Crisphead: Recommendations for Maintaining Postharvest Quality.