LDD Moth (Lymantria dispar dispar)

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 unfortunately considered a well-established regional pest in southern Ontario.

A single LDD caterpillar can eat an average of one square meter of leaves.

The City is taking an Integrated Pest Management (IPM) approach. 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 only feed and damage trees for a short period in June and 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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