Oakville schedules aerial LDD moth spraying for early next week

By Gene Pereira

Published on May 27, 2022 at 4:24 p.m.

The City of Oakville Forestry Section has scheduled the first of two aerial sprays to control the LDD moth infestation to take place Monday morning (May 30). INSAUGA PHOTO

The first of two aerial LDD moth infestation sprays in Oakville will take place on Monday, May 30.

The Oakville City Forest Section will take off with a low-flying helicopter between 5 a.m. and 9 a.m. and spray 33 woodlots in the city with what they say is a safe, natural insecticide.

The insecticide will help protect the urban canopy against the invasive moth caterpillars.

A second spray will be needed within a week or two after the first, weather permitting.

Additional ground sprays may occur during the same time period to target city trees adjacent to woodlots that have been identified as being at high risk for LDD moth presence.

Monday’s spray is subject to weather conditions.

In the event of a date change or cancellation, an updated notification will be posted on www.oakville.ca and on the city Facebook and Twitter accounts.

During spraying, woodlots and trails will be temporarily closed and will reopen later the same day. There are no special requirements for residents near spray areas.


  • Based on population surveys conducted in 2021, Oakville faces extreme levels of LDD moth infestation this year that could affect 358 hectares (885 acres) of the city’s woodlots and result in significant tree loss. if no action is taken.
  • The LDD moth is a non-native insect that is considered a major destructive pest in North America. These insects are of concern because the larvae (or caterpillar stage) can devastate trees and forests by rapidly eating large quantities of leaves, primarily oak leaves. When leaves are lost in successive years, trees can die.
  • Municipalities have conducted successful aerial spraying programs using the natural insecticide Bacillus thuringiensis Kurstaki (Btk) for decades. It has replaced chemical insecticides in aerial spraying programs worldwide. BtK is approved for use by Health Canada’s Pest Management Regulatory Agency.

For more information on the aerial spray program, visit Moth LDD or contact ServiceOakville at 905-845-6601 or email [email protected].

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