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Gypsy moth aerial spray treatment begins May 15 outside Castlegar

Province of British Columbia
By Province of British Columbia
May 8th, 2020

 The first aerial-spraying treatment to eradicate invasive gypsy moths from 167 hectares of rural land in Raspberry, north of Castlegar, will occur next week, weather permitting.

The gypsy moth is destructive to native and urban forests and orchards. Without treatment, it could spread to other parts of the province and put at risk hundreds of species of trees and shrubs, including those in endangered Garry oak ecosystems.

Spraying will take place north of Broadwater Road, and extend east of Pass Creek road and west of Marshall Road.

Spraying will start shortly after sunrise (approximately 5:20 a.m.) and should be completed by 7:30 a.m. daily. Up to four separate treatments are required this spring. Unless delayed by poor weather, each treatment is expected to take one to two mornings to apply. The ministry aims to complete the spraying by mid-June.

The spray area will be treated with Foray 48B, which contains Bacillus thuringiensis var kurstaki (Btk). Btk is an organic, natural agent that has been approved for the control of gypsy moth larvae in Canada since 1961. Foray 48B and other Btk formulations received certification for acceptable use on certified organic farms by the Organic Materials Review Institute of Canada in April 2018.

Btk is naturally present in urban, forest and agricultural soil throughout the province. It does not harm humans, mammals, birds, fish, plants, reptiles, amphibians, bees or other insects and affects caterpillars only after they have ingested it.

The spray will be applied by a low-flying plane. Residents within and adjacent to the treatment area will likely hear the aircraft at some point during the treatment. The spray equipment is GPS-calibrated and controlled. Spraying will occur only when the plane is immediately over the treatment area.

Anyone wishing to minimize contact with the spray material may choose to remain indoors with their windows and doors closed during the treatment, and for at least 30 minutes after. Pets and livestock that may be frightened by the aircraft should be secured or brought indoors.

Poor weather or wind may cause treatments to be postponed with little advance notice, and the treatment will resume the next suitable morning.

A telephone line is staffed during business hours, and provides up-to-date spray schedules and recorded information 24 hours per day toll-free, at 1 866 917-5999. Individuals subscribed to the gypsy moth listserv (automated email updates) will receive program updates. To subscribe, visit:

Learn More:

To learn more about gypsy moths, or subscribe to the listserv, visit:

For health information any time, call HealthLinkBC at 811, toll-free and available in more than 30 languages. HealthLinkBC services for the deaf, hard of hearing and speech impaired are available by calling 711 for TTY or 604 215-5101 for video relay service.

Health information on gypsy moth spraying in eight languages is available at:

Dr. Richard Stanwick, chief medical health officer of Island Health, discusses gypsy moth spray-treatment programs:

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