cannabis industry

Updated List of Pesticides Allowed for Use in Marijuana Production

The following information was received via e-mail from the Washington State Liquor and Cannabis Board (WSLCB) on October 1, 2020 on behalf of the WSDA.

WSLCB updates list of pesticides allowed in cannabis production

The Washington State Department of Agriculture (WSDA) has recently updated the list of  pesticides that are allowed for use in marijuana production in Washington State, based on  criteria previously established by WSDA.

WSDA has added six new Section 3 pesticides and four new Section 25(b) pesticides to the list of allowable products for a total of ten new products. There were no products removed from the list.  The list currently contains 307 Section 3 pesticides and 90 Section 25(b) pesticides, for a total of 397 products.

WSDA has two columns on the list: (1) Section 3 pesticides that are subject to Worker Protection Standard (WPS) requirements, and (2) Section 3 pesticides that are limited to use by non-commercial “HG Only” marijuana growers. The products designated as “HG Only=Yes” may only be used by those individuals authorized to home grow medical use marijuana.

Products marked as “HG Only=Yes” may not be used in the commercial production of marijuana.

Spray adjuvants are not included on the list—however any spray adjuvant that is labeled for use on food crops can be used with an allowed pesticide that is applied to marijuana, as long as the intended use is authorized by the spray adjuvant label. For example, a spray adjuvant labeled only for use with an herbicide cannot be used with an insecticide or fungicide. Information on spray adjuvants that are registered for distribution in Washington is available from the WSU PICOL database.

Please check your stock of pesticides against the list to ensure that you are using an allowed product. Marijuana growers can continue to use any existing stocks of pesticides that were removed from the list, but no new product can be purchased.

All of the pesticides that were added to the list contain active ingredients that were already allowed for use in marijuana production.

Some pesticides are labeled for application to soil or to crop plants, while some pesticides are labeled for application to both soil and crop plants (e.g., insecticides, fungicides). Other pesticides include herbicides labeled for direct application to, and control of, unwanted plants (i.e., weeds). Remember to read, understand, and comply with all applicable label directions and precautions when using any pesticide.

Pesticides Added:                                                                    Registration Number

1.    Howler Lawn and Garden Organic Fungicide                  EPA No.  91197-3-92488

2.    Onward                                                                             EPA No.  90866-23-95775

3.    Promote                                                                            EPA No. 90866-23

4.    Spear LEP Biological Insecticide                                     EPA No. 88847-6

5.    Spear T Liquid Concentrate                                             EPA No. 88847-6

6.    Howler Fungicide                                                              EPA. No. 91197-3-92488

7.    Eco-1 40                                                                            WA No.  74578-19003

8.    Huma Gro Thyme Pro                                                      WA No.  999690-20001

9.    Mammoth Canncontrol                                                     WA No.  997320-20001

10.  Protection Plus Insecticide and Fungicide                       WA No.  994030-20001

You can find the complete list of pesticides that are allowed for use in marijuana production, the criteria WSDA used to establish the list, and information regarding statewide stop-sale orders in Washington on the WSDA web site:

Contact Information:

For information regarding the registration of pesticides and fertilizers, please contact the WSDA Pesticide and Fertilizer Registration Section.

Phone: 360-902-2025

Email for pesticide registration:

Email for fertilizer registration:

For information regarding how to comply with the pesticide label, please contact the WSDA Pesticide Compliance Program.

Phone: 360-902-2040


For any other questions, please contact your Liquor and Cannabis Board enforcement officer.

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