WAC 16-157-120   Organic mushroom standard.  (1) The producer must maintain a production environment that prevents contact between organically produced mushrooms and prohibited substances throughout the entire growing cycle, harvesting and post-harvesting process. The producer must not use lumber treated with arsenate or other prohibited materials for new installations or replacement purposes in contact with the growth substrate.

     (2) Organic and nonorganic production must be in separate facilities and have separate ventilation systems.

     (3) The producer must use organically produced spawn.

     (4) The producer may use nonorganic agar medium that may contain antibiotics not to exceed 1/25th of a gram per liter of agar mix.

     (5) Agricultural materials including grain and straw that are used in production substrate must be organically produced. Sawdust, logs or other materials derived from wood used as a growth substrate must originate from trees that have been grown in areas free of prohibited materials for at least three years, and must not have been treated with a prohibited substance after tree harvest. Producers may include nonsynthetic, nonagricultural materials in substrate used to produce mushrooms.

     (6) All growing medium amendments must be certified organic.

     (7) Manure and any nonorganic agricultural material used as a growth substrate must be from an organic source. Compost used as a growth substrate must consist of certified organic feedstocks.



[Statutory Authority: Chapter 15.86 RCW. 02-10-090, § 16-157-120, filed 4/29/02, effective 5/30/02.]