Pesticide & Fertilizer Use on Marijuana


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Pesticide and Fertilizer Use for the Production of Marijuana in Washington

Pesticides

To assist growers authorized by I-502 or I-692 who use pesticides for the production of marijuana in Washington, WSDA has developed a list of pesticides [PDF 263kB] that meet WSDA Criteria [PDF 120kB] for use in marijuana production.

Inclusion on the list is not an endorsement or a recommendation regarding the use of any specific pesticide for the production of marijuana in Washington.

The list only includes registered pesticides that are allowable for use in marijuana production as defined by the above criteria. The list has been provided to the Washington State Liquor and Cannabis Board and the Washington State Department of Health, and will be updated by WSDA as needed.

PICOL

A searchable list of these pesticides is available from Washington State University Pesticide Information Center Online (PICOL) database.
 
  • From the "Pesticide Information Center Online (PICOL) Databases" web page, click on the "Registered Labels” button.
  • After the "PICOL Simple Search” web page appears, select "I-502/I-692 (WA only)” in the "Item to Search on” drop down menu, choose "EQ” in the "Operator” drop down menu, choose "Yes” in the "Common Name” drop down menu, and then click on the "Submit Query” button.
  • When the "Search Results” web page appears, click on the "Format Labels” button.
  • When the "Choose your output type” web page appears, click on the "View Labels” button. You can either view the list, or export it to Excel.
  • Tutorials for using PICOL are available on YouTube.

Fertilizers

Marijuana growers authorized by I-502 or I-692 who use commercial fertilizers for the production of marijuana in Washington can use any fertilizer that is registered by WSDA, except for those fertilizer-pesticide products that are not specifically allowed for use on marijuana. (The majority of the fertilizer-pesticide products that are not specifically allowed for use on marijuana are labeled and intended for use on turf only.)

Worker Protection Standard

The purpose of the Worker Protection Standard (WPS) is to protect agricultural employees from pesticides and their residues.  WSDA has developed guidance to help marijuana growers understand and comply with WPS requirements. The regulation requires agricultural employers to:
  • Notify their employees when pesticide applications occur.
  • Ensure that employees have received training specific to their potential exposure to pesticides.
  • Provide adequate protective equipment and decontamination facilities to employees exposed to pesticides.
  • Monitor employees using highly toxic (Category I) pesticides.
  • Facilitate medical treatment for any employee who exhibits signs of a pesticide poisoning.
Agricultural employers include owners or managers of farms, forests, greenhouses or nurseries where pesticides are used in the production of agricultural plants, including marijuana. They are also commercial applicators that apply pesticides to these sites.

Options for Training Workers

If the pesticide label that you are applying includes "Agricultural Use Requirements", workers must be trained on the requirements of the Worker Protection  Standard (WPS).  There are three options to train workers on WPS requirements:

WSDA has developed guidance to help marijuana growers understand licensing requirements to apply pesticides on marijuana.

Chemigation & Fertigation Technical Assistance Program

 WSDA has developed a technical information bulletin [PDF 115kB] to help marijuana growers understand and comply with chemigation and fertigation requirements.
  • Chemigation is the use of an irrigation system to apply a pesticide or a system maintenance compound.
  • Fertigation is the use of an irrigation system to apply commercial fertilizer, soil amendment, or reclaimed water from food processing and wastewater treatment facilities.

Pesticide Storage

Your local fire department may have additional requirements for pesticide storage.

Waste Pesticide Disposal

The goal of this program is to properly dispose of unused or unusable pesticides to prevent human and animal exposure, prevent use of cancelled pesticides on crops and to eliminate the potential source of contamination to the environment.
 
 
 

 


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