Invasive spongy moth treatment spraying approved for Lower Mainland, Interior

Apr 19, 2024

Aerial spray treatments will be done in the Lower Mainland and three locations in the southern Interior in spring 2024 to eradicate spongy moths and minimize the risk they pose to forests, farms, orchards and trees.

Under the direction of the B.C. Plant Protection Advisory Council’s Spongy Moth Technical Advisory Committee, the ministry plans to treat the following areas in the Interior and coastal region:

  • Cranbrook: 299 hectares (ha)
  • Kamloops: 80 ha
  • West Kelowna: 52 ha
  • Langley: 30 ha
  • Tsawwassen: 203 ha

Invasive spongy moths, also known as Lymantria moths, pose a risk to B.C.’s ecosystems and economy. Spongy moth caterpillars feed on tree leaves and have defoliated sections of forests and residential areas in Ontario and the eastern United States in recent years. Untreated spongy moths risk spreading to other areas of B.C. and are a threat to urban forests and farms.

The biological insecticide used for treatment is Foray 48B, which is used in organic farming. The active ingredient Bacillus thuringiensis var kurstaki (BtK) is naturally present in urban, agricultural and forest soils in the province. It affects only moth and butterfly caterpillars after they have ingested it. The sprays target the emergence of spongy moth caterpillars. Btk was approved for the control of spongy moth larvae in Canada in 1961.

The ministry is planning three applications of Foray 48B between late April and mid-June 2024. Each treatment will occur seven to 10 days apart and could take up to two days to complete. Each spray is expected to commence at first light and end no later than 7:30 a.m. Changes in weather conditions may cause delays or cancellations of sprays with short notice.

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