Friday, May 11, 2018

Answering gypsy moth eradication questions

Karla Salp
WSDA Communications

On Tuesday, May 8, we conducted the first of three planned treatments to control gypsy moth in Pierce and Kitsap counties. Various questions about the treatment have been asked on social media both before and after the treatment. While we have responded to those concerns on various posts on social media, we wanted to provide a central location for information about two topics: a viral video and treatment on school grounds in Kitsap County.

Spraying on School Grounds

Cougar Valley Elementary

During our treatment planning, we anticipated treating Cougar Valley Elementary school at 10 a.m., which is what we communicated to the school district prior to treatment.

Subsequent adjustments to the flight plan were necessary to manage flight restrictions over the Kitsap Naval Base and for the safety of the pilot. In order to avoid flying in the prohibited area, the applicator had to modify the initial flight plan. This meant that the pilot would arrive at the school sooner than initially anticipated. We indicated to the applicator that treatment should not start at the school until after 9:10 a.m. when classes would start and students would be inside. The pilot arrived at about 9:05 a.m. and began treating the school grounds. Some children were still outside when treatment began.

We worked with the Central Kitsap School District on Tuesday to inform parents, identify what happened, and provide revised information about when to expect treatments to start at the school. We have finalized a modified application plan by working with the base personnel to adjust flight time restrictions over the base. This will now allow us to treat the school grounds no earlier than 9:30 a.m., if future treatments occur on a school day. We have also communicated this revised plan to the school district.

Again, Btk, the product we use to treat for gypsy moth caterpillars, has an excellent safety record. More info about Btk and human health is available on our website. However, if anyone has health concerns from the treatment, they can contact the Washington State Department of Health at 1-877-485-7316.

Clear Creek Elementary

There have been claims that Clear Creek Elementary school was sprayed when children were outside for recess. Clear Creek Elementary was not in the treatment area and was not sprayed. However, the plane did fly over the school as it was making its turns.

Viral Video

A video which has now been viewed thousands of times makes several claims about the treatment in the Silverdale area. In the video, the individual claims that her animals are being harmed by the spray and she makes broad statements about the types of impacts the spray can cause. Here are the facts:

  • Btk is not toxic to humans, pets, livestock (including goats,) birds (including chickens,) bees, fish, or other animals. It is toxic only to caterpillars and only after the caterpillar has ingested the Btk. Only coming in contact with the product, but not consuming it, will not harm even the caterpillar.
    Btk is a naturally occurring soil bacterium. Foray 48B, the formulation of Btk used in this application, is approved for use in organic agriculture. More information about Btk can be found on our website.
  • The video makes various claims about potential detrimental health impacts to humans. Btk has an excellent safety record. You can find more information about the Washington State Department of Health’s review of Btk and Foray 48B on DOH’s website and on our website.
  • The video claims to show Btk in the air on her property. While Foray 48B can be seen far overhead when the plane first dispenses it, the product is not visible as it approaches the ground. Also, according to our ground observers, there was fog in the area. 

In addition to the video, this same individual has made other claims on social media both before and after the treatment.

  • The individual claims that we sprayed her property 19 times. Treating the entire 1,000-acre block requires several passes with the plane. Anyone in or near the treatment area would have heard the plane many times. However, no place in the treatment area was treated more than once.
  • There have been claims that we used a product other than Btk, which left an orange powder. Btk does not leave a powder but does leave a sticky residue. See our blog about what to expect during gypsy moth treatments
  • There have been claims that Btk killed her bees. Btk is not toxic to bees. In many years of using Btk, we have not had complaints of Btk killing bees. 

Our commitment

Our agency has been working for over 40 years to prevent gypsy moths from becoming established and have used Btk many times for this purpose. Btk is also used commonly around the U.S. and the world to control caterpillars for gypsy moth treatments and on organic farms. We chose this product because it is both safe and effective. Our own staff members are always stationed in treatment areas, whether conducted by air or on the ground, and have the highest exposure to Btk. They have never reported any ill effects from exposure to this product.

While Btk has a long-term, excellent safety record and is even approved for use in organic agriculture, the risk that gypsy moths pose not only to the environment but also to human health is substantial. While we continue to protect our environment from this devastating invasive pest, our goal is always to provide extensive outreach so that the public is aware when eradication takes place.

Outreach this year has included news releases, social media outreach and education, public open houses, four postcard mailings to addresses in or near the treatment area, signs in the treatment areas and promotion of the ability to sign up for email, text, or robocall notifications to find out when treatments will occur. We are planning two additional treatments and encourage those who would like to know when they occur to sign up for these notifications.