Information on Spraying and Trapping

2017 trapping in progress, results not available yet.

Spraying by helicopter of the pesticide Foray 48B took place in Washington State in 7 different areas beginning on April 16, 2016.  We are attempting to post the latest information here  as it become available.

Keep in mind that the spray can drift considerably outside the zone boundaries – up to one mile even with no wind.

What can you do to protect yourself?
  • Close and seal all doors and windows of your dwelling/office. Don’t forget chimney flues also.
  • Do not leave for at least several hours if possible after the spraying. Spray droplets stay suspended in the air for a number of hours, especially if there is little wind.
  • Best option: seal up your dwelling, leave the area before 6AM and do not return until at least the afternoon. Open all windows at this point to air out the interior; spray has been shown to infiltrate even into a sealed building and be at higher concentrations indoors after 12 hours.

2015/6 Gypsy Moth Trap Map

This map shows the projected locations and extent of gypsy moth pesticide spraying to be conducted by the Washington State Dept. of Agriculture (WSDA) in April and May 2016. Spray zones are identified, either the required 1 square mile spraying area (by helicopter) for an Asian gypsy moth (AGM), or smaller spray zones for  the Euro/American moth (EGM).

You can get the map legend by selecting the icon in the upper left. There, you can turn on or off the spraying and trap layers to view them separately.  The trap layer shows the locations of all gypsy moth catches by the WSDA in 2015.  The WSDA runs a trapping program each year; thousands of traps are placed around the state and monitored. Pheromone attractant traps were used. A red teardrop icon signifies a Euro/American variety, and a yellow diamond signifies an Asian variety. The number of moths found at a site is shown as a number next to the icon.

Spraying guidelines: in general, moths trapped in one locale over a period of 3 years will trigger pesticide spraying. The time to spraying may be shortened if many moths are found, or other lifestages are located. A single Asian gypsy moth detection will trigger an aerial spraying over a square mile area.

If you have not experienced an aerial pesticide spraying, or are just curious about spraying for gypsy moths and the possible human and environmental effects, here are some quick video resources:

More up-to -date and accurate maps for the 2016 spray zones can be found at these links:
Seattle-Capitol Hill
Tacoma low and high elevation
Kent/Green River Natural Resources Area
Nisqually, near National Wildlife Refuge
Gig Harbor

Schedule as of May 1, 2016:

April 16 – Tacoma low elevation
April 17 – Vancouver, Nisqually and Kent
April 18 – Gig Harbor and Lacey
April 19 – Tacoma high elevation
April 20 – Capitol Hill (Seattle) and Tacoma high elevation
April 21 – Tacoma low elevation
April 23 – Kent and Nisqually
April 25 – Vancouver
April 26 – Capitol Hill, Gig Harbor, Lacey and Nisqually
April 27 – Kent and Tacoma high elevation, starting 5:45AM
April 28 – Tacoma high elevation, 5:45AM
April 30 – Tacoma low elevation, 5:30AM
May 1 – Kent, Lacey, Nisqually, and Vancouver 5:30AM
May 2 – Capitol Hill, 5:45AM
May 3 – Tacoma high elevation, 5:30-9AM

Maps for previous years:

2016: 10,500 acres in Washington State were sprayed with the pesticide Foray48B this year. Spray areas were on Capitol Hill in Seattle, Tacoma , Kent, Gig Harbor, Nisqually, Lacey, and Vancouver.  10 Asian gypsy moth trappings triggered 9 square mile spraying zones over schools, hospitals and sensitive riparian areas.

2014: A large number of moths were trapped near the site of the single trapping in 2013, centered at E John St. and 18th Ave. East on Capitol Hill. Because of the large number of moths, this area is in danger of spraying in 2016.

A 220 area between Yacolt and Mt. St. Helens near Cedar Creek was sprayed by helicopter, in April 2015. Check the map for the exact location. See our videos above to learn about helicopter spraying.

2013: Only 1 Euro/American gypsy moth moth was trapped in 2013 for all of Washington, in Seattle at 16th Ave. E between Olive and Pine. No spraying in Washington is likely for 2014.

2012: As predicted, the Ft. Dent/Starfire area in Tukwila was treated in April 2013 with a combination of aerial mating disruption (disparlure) pellets and ground spraying of Foray-48X (btk-based insecticide). The spray area was about 181 acres total, a 1/2 mile square area roughly centered on the eastern entry to the park. The spraying will likely have adverse effects, as it drifted into the adjacent Green River and the Black River Riparian Forest. No tracking was done to observe if there was any environmental impact.

Info on gypsy moth spraying