Some B.C. residents may want to stay indoors ahead of months-long invasive pest spraying
B.C. is going to start spraying for an invasive pest moth species at the end of the month, and it’s warning residents who want to limit their exposure to the chemicals to stay inside with doors and windows closed.
According to the Ministry of Agriculture and Food, the Province will begin spraying for spongy moths in Delta and Squamish on April 30, and it is expected to last until June 30.
B.C. says that the pest is an invasive species and a “serious threat” that can be destructive to both forests and farms.
Thirty-six hectares of land will be sprayed around Beach Grove in Delta, with a further 121 hectares to be sprayed in Squamish, west and south of the intersection of Buckley and Third.
The ministry says that the treatment has been approved by Health Canada and that the treatment is weather-dependent.
“Spongy moth caterpillars pose a serious pest as they feed on tree leaves, resulting in defoliation of forests, parks, crops and residential areas,” the ministry says, adding that without treatment and an eradication program, it is “highly likely” spongy moths would become permanent.
If that panned out, the ministry says that it could cause significant trade implications for the agriculture and forestry sectors.
For anyone worried about the chemicals involved, the ministry says the active ingredient is Bacillus thuringiensis var kurstaki (Btk), which is naturally present in soil.
The ministry says Btk is used in organic farming for control of caterpillar pests and that it only affects the stomachs of caterpillars, without having an effect on people, pets, birds or other wildlife. It was last used in 2024.
On days the spraying will occur, it is expected to start after first light and end before 7.30 a.m., though changes in weather could cause delays or cancellations.
“People who want to minimize their exposure during the application may remain indoors with their windows and doors closed during the treatment and for at least an hour after,” the ministry says.
Folks should follow standard hygiene practices, like washing hands after outdoor activities, and washing fruits and veggies from treated areas before consuming them.
More info on the invasive pests can be found on the B.C. spongy moths website.