Spongy Moth News

Visit this page for regular notifications and updates about Spongy Moth treatments in B.C.

What you need to know

Each location will be treated three times with Foray 48B (active ingredient Btk), and each treatment will occur approximately seven to ten days apart. Treatments will occur between first light (between 5:00 am and 6:00 am) and will be completed no later than 7:30 am. To avoid exposure to the spray, it is recommended that residents within the treatment area stay indoors during spraying and for up to 30 minutes to one hour after spraying is complete, with doors and windows closed. Foray 48B will naturally break down from UV exposure or can be washed off surfaces with soap and water.
 
Please note that spray dates are subject to change under short notice due to insect development rates (optimum spray windows are provided by a temperature driven model) and weather conditions. Rain or high winds will postpone a scheduled treatment, and the treatment will resume the following suitable morning. To stay up-to-date and receive automated updates of this page, please scroll to the bottom of this page to the ‘Subscribe’ option.
 
If you are concerned or experience any adverse health effects, please speak to your health care provider or call 8-1-1 (or 7-1-1 for the deaf and hard of hearing) to get personalized assistance or visit HealthLink BC, and report your experience to the 24-hour spongy moth information line (1-866-917-5999) so the information can be shared with the product supplier and Health Canada. 

First treatments in Squamish and Delta

The Province will be treating the following areas with Foray 48B, active ingredient Btk, to eradicate establishing invasive spongy moth populations beginning next week.

First applications are planned for 5am to 7:30am:

• Friday, May 1 – Squamish: Squamish Treatment area map (JPG, 175KB)
• Saturday, May 2 – Delta: Delta treatment area map (JPG, 124KB)

What you need to know

• The treatment areas will have signs at all entrance points in both Squamish and Delta; In Squamish, there will be LED signs on highways to notify traffic of low-flying aircraft
• Foray 48B is approved for use over populated areas and although it poses a low risk to humans, we still recommend that individuals stay indoors during the treatment and for up to one hour after to avoid exposure
• If you are concerned or experience any adverse health effects, please speak to your health care provider or call 8-1-1 (or 7-1-1 for the deaf and hard of hearing) to get personalized assistance or visit HealthLink BC, and report your experience to the 24-hour spongy moth information line (1-866-917-5999) so the information can be shared with the product supplier and Health Canada. 

Please note: Treatment dates are determined based on biological development of the pest and can change with short notice depending on weather. Next notifications will be done at approximately 48 hours and 24 hours before each planned application. Each treatment area will be treated three times and each treatment will be scheduled approximately 7-10 days apart

To learn more about our program and stay up-to-date on the latest information

Tentative treatment schedule - April 22, 2026

Aerial spraying to eradicate establishing spongy moth populations in Delta and Squamish are anticipated to commence the week of April 27th. Spray dates will be announced on this webpage, the spongy moth 24-hour information line (1-866-917-5999) and on lawn signs bordering the treatment boundaries. 

Pesticide use permits issued - April 9, 2026

The Ministry of Environment and Parks has issued a Pesticide Use Permit authorizing the application of the biological insecticide Foray 48B over two locations in B.C.  Various notification and application conditions are outlined in the permit and will be carried out by the Ministry of Agriculture and Food and Ministry of Forests.  Note that the strain of Btk used in Foray 48B is ABTS-351.

• Pesticide Use Permit No. 924-0001-26-26 (PDF, 456, KB) (Delta and Squamish)

Current insect development model projections indicate first treatments will begin in Delta as early as April 28 and as early as May 1 in Squamish. Each area will be treated three times and each treatment will be approximately 7 - 10 days apart. Aerial spraying will occur between first light and completed by 7:30 am. To avoid contact with the spray it is recommended that residents within the treatment areas stay indoors with doors and windows closed for the duration of the spray and for up to one hour after spraying is completed. 

Please note that the spray dates are subject to change, particularly with the recent warm weather and updates will be posted on this page and on lawn signs around the treatment areas. To receive automated program updates, scroll to the bottom of this page and enter your email below the 'Subscribe' box and submit).

Pesticide use permit: Not issued - April 2, 2026

There has been a slight delay in the issuing of the Pesticide Use Permit Application for this spring's aerial-spray treatments in Delta and Squamish. As a result, on April 2, 2026, advertisements notifying the public about the treatments ran incorrectly in the Delta Optimist and Squamish Chief. Updated public notices will appear in the Squamish Chief and Delta Optimist once the permit is issued. The planned treatment window between mid-April and June 15, 2026 remains the same.

Order-in-Council signed - March 16, 2026

The provincial cabinet has approved the "Spongy Moth Eradication Regulation" authorizing the treatment of the two areas described in the Pesticide Use Permit Application (PDF, 355KB). Read the OIC B.C. Reg.205/2022 (PDF, 1MB).

2026 Open houses

The B.C. Plant Protection Advisory Council's Spongy Moth Technical Advisory Committee will host open houses in Delta and Squamish. Specialists will provide program information and answer questions about the 2025 trapping season and the 2026 treatment areas during the scheduled open houses:

• Delta: Wednesday, February 18, 2026, 5:30-8:00 p.m. at Beach Grove Elementary (library).
• Squamish: Thursday, February 19, 2026, 5:00-8:00 p.m. at Howe Sound Inn and Brewing Company (Garibaldi Room)

All residents within the treatment areas and a 300 m buffer zone will receive postcards inviting them to these open houses. View the postcards below for open house details:

• Delta Spongy Moth Open House February 18, 2026 (PDF, 440KB)
• Squamish Spongy Moth Open House February 19, 2026 (PDF, 440KB)

2026 Pesticide use permit application

The Ministry of Agriculture and Food has applied for a Pesticide Use Permit for aerial spraying of Foray 48B to eradicate spongy moths in Delta and Squamish, B.C:

• 924-0001-26-26 Delta and Squamish Pesticide Use Permit Application (PDF, 351KB) 

A person wishing to contribute information about the treatment areas for the evaluation of this permit application must send copies of the information to both the applicant at British Columbia Ministry of Agriculture and Food, 1767 Angus Campbell Road, Abbotsford, BC V3G 2M3 or by email: Spongy.moth@gov.bc.ca and the administrator under the Integrated Pest Management Act at Ministry of Environment and Parks, Suite 200 - 10470 152 Street, Surrey, BC V3R 0Y3 or by email: ENVCIA@gov.bc.ca by end of day Saturday, February 28, 2026.

2026 Spongy moth program announcement

Trapping and monitoring results from 2025 indicate spongy moth populations are establishing in two locations and require eradication. Considering the vegetation complex in these locations, aerial sprays are required to eradicate this non-native, invasive species. Aerial spraying is planned for spring 2026 for:

• Delta (Tsawwassen): 38 ha (Delta 2026 Treatment Map (PNG, 4.3MB)
• Squamish: 121 ha (Squamish 2026 Treatment Map (PNG, 7.1MB)

The Ministry of Agriculture and Food is in the process of submitting a Pesticide Use Permit Application for the 2026 eradication program. Ministry of Forests will provide operational support.