LDD Moth (Lymantria dispar dispar)
The LDD Moth, which is commonly referred to as the European Gypsy Moth, is a non-native insect that was introduced to Canada in 1969.
The impacts of defoliation from the LDD Moth can vary from minor to severe and it is generally understood that a healthy tree can withstand some defoliation. However, the defoliation of the trees can make them more vulnerable to disease, other insects, and environmental stressors. A single moth caterpillar can eat an average of one square meter of leaves.
The tree types most commonly impacted by the LDD Moth include oak, birch, poplar, willow, and maple trees. The Moth may also defoliate softwood trees such as white pine and blue spruce.
Not sure what type of trees you have? Check out Forests Ontario to find out.
Frequently Asked Questions (FAQs)
What does the LDD Moth look like? |
There are different life stages of the LDD Moth and in each stage the appearance changes significantly.
More images and further information can be found on the Invasive Species Centre website. |
What is the life cycle of the LDD Moth? |
The LDD Moth has four stages of life:
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Management on private property - What can you do? |
The Province of Ontario has released a diagram that identifies the LDD Moth’s lifecycle and options for controls during each stage. Looking for professional advice? Contact a tree specialist or an accredited arborist to develop a plan that suits your needs. A common and effective pesticide used to manage an LDD Moth infestation is btk (bacillus thuringiensis kurstaki). Before considering the use of this product, consult a reputable contractor. Pesticides are most effective at the caterpillar stage (Mid-April to Mid-May). Please use caution. The LDD Moth has long hairs that can cause skin irritation or allergic reactions for some people. For safety, use gloves while handling caterpillars. |
How can I safely remove egg masses? |
Egg masses should be removed and destroyed at the beginning of each year, before the spring. Below are step-by-step instructions on how to manually remove egg masses:
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How do I use a burlap banding kit? |
Burlap banding kits are effective at the caterpillar stage of the Moth's life. Below are step-by-step instructions on how to install a burlap banding kit:
The use of protective gloves is recommended. |
Does the LDD Moth have any natural enemies? |
Although direct efforts by humans can assist in managing an LDD Moth infestation, there are also natural checks and balances that exist that control the Moth population:
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