LDD Moth (Lymantria dispar dispar)

Help Protect Markham's Urban Forest

Due to overwhelming demand for burlap trap kits for LDD caterpillars, we are now out of stock.

Installing a burlap trap on affected trees beginning in early May through August will make it easier to collect and remove the caterpillars and female moths. In August, be sure to remove your burlap bands for future use, if required.


In the event that managing LDD caterpillar populations on your private property becomes unfeasible through the methods described, seek a professional tree care company for assistance.

Help Protect Markham's Urban Forest

LDD Moth (Lymantria dispar dispar) is a non-native, invasive forest pest that was introduced to North America from Europe in 1869. It was first detected in Ontario in 1969 and has quickly spread across southern Ontario during the 1980’s. LDD is considered a well-established regional pest in southern Ontario and is known to have cyclical outbreaks every 7 to 10 years.

Although complete eradication of the LDD moth is impossible, the City is taking an Integrated Pest Management (IPM) approach to help reduce the LDD egg mass count and limit the LDD caterpillar damage, thus helping protect our Markham trees and green infrastructure. This means we are using different management techniques to address the pest population starting with the least harmful to the environment.

The caterpillars tend to feed on and damage select tree species (mainly Oak, Birch and Maple) between the months of early May and mid-July. The earlier and more often that the LDD lifecycle can be interrupted, the more successful our approach to control will be.

The lifecycle diagram below indicates when control opportunities exist.

Lymantria dispar dispar
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