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Washington bans Guardian Mite Spray on marijuana crops


A new bulletin from the Washington State Liquor and Cannabis Board has banned Guardian Mite Spray on statewide marijuana crops.

See the full release below:

Marijuana Producers, Processors, and Retailers

Bulletin No 16-01


Date:              January 20, 2016
To:                  Marijuana Industry Members
From:             Jodi Davison, Marijuana Examiner Program Supervisor
Subject:        Guardian Mite Spray No Longer Approved for Use on Marijuana

Until further notice, Guardian (WA Reg. No. 997690-15001) is no longer allowed for use on marijuana in Washington. Information from the Oregon Department of Agriculture and the pesticide product registrant (All In Enterprises) indicate that this pesticide product contains an ingredient not permitted on the list of pesticides allowed for use on marijuana in Washington.

The Washington State Department of Agriculture (WSDA) is updating the allowed pesticides list, and will be working with the registrant to resolve this issue. LCB will provide the updated list to licensed producers as soon as it is available.  The PICOL database has already been updated to reflect this change.

Action Required


  • Immediately discontinue use of Guardian and remove the product from the licensed premises
  • Advise all processors to whom you have sold marijuana treated with Guardian that the marijuana may have been treated with an unapproved pesticide


  • Provide a notice about the possible use of the unapproved pesticide to retailers who carry your products that may have been treated with Guardian


  • Post the notice provided by the processor in a conspicuous location on your licensed premises

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