Mushroom Bags, mushroom substrate bags, spawn bags for mushroom farming

Mushroom Bags, mushroom bags substrate, spawn bags for mushroom farming

Plastic mushroom bags used in mushroom Spawn Production

Non Filtered bags in spawn production

This method is used extensively in Asia and in environments where filtered bags are either unavailable or too costly. Usually bags of 15 to 17 cm wide and about 30 cm long with gussets, are filled with wet substrate of mixed grain and saw dust. They are typically filled about ¾ high, autoclaved at 121° for a certain length of time, and cooled. The mother culture is introduced from the top where a hole is prepared. After which a collar and cotton plug is installed and the bag is left to incubate. This done in a glove box.

The advantage of using this bag is that it is inexpensive and PP bags with no filter are easily available. However, without some custom additives, bags are usually too brittle, and when standing up, the lower four corners may easily have holes. The collar is reusable, and new cotton is used every time.
Polyethylene bags without filters are not used for spawn production.

Breathable Polypropylene bags with filters

Breathable polypropylene bags with different filter types are widely used for spawn production. In farms where spawn is produced for farm use, a stand up bag is generally used. Small bags of 10 by 8 by 30 cm gusseted with a filter 10 cm down from top are common. Larger bags with a 20 by 12 cm foot print and 50 cm high are also commonly used.
For Agaricus spawn, grain spawn, filters of the PP non woven with PP membrane are used. The filter are low gas transmission filters that retain CO2 . Unicorn type M filter and Celgard are examples of this filter. A preferred pore size is 0.2 micron.
Shiitake and pleurotus and most specialty mushrooms prefer a higher gas exchange filter.