Lymantria dispar moth at the caterpillar stage

Lymantria dispar dispar (or LDD moth) is an invasive insect native to Europe. At the caterpillar stage, it feeds on the leaves and foliage of a wide variety of trees, causing defoliation. In Canada’s Capital Region, the LDD moth can feed on over 300 plant species, including landscape and garden plants.

Defoliation does not typically harm the tree or cause mortality. Trees often produce new leaves later in a growing season to compensate.

What we’re doing

The NCC is currently monitoring the presence of the LDD moth on NCC-managed lands. We are also in contact with other regional and provincial stakeholders on this subject. We will work with our partners to ensure a consistent approach in managing this invasive species.

The NCC is working with Quebec’s Ministère des Forêts, de la Faune et des Parcs and the Canadian Food Inspection Agency to help monitor potential and confirmed infestations of insect pests.

The NCC is also helping to increase public awareness about not moving firewood, to limit the spread of disease and insect pests. For more information: https://inspection.canada.ca/plant-health/forestry/don-t-move-firewood/eng/1500309474824/1500309544561.

What you can do

If you want to reduce the impact of the LDD moth on your property, there are individual control options. These consist primarily of physical removal of caterpillars and egg masses.

More information