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Cedar Leafminer 
Description
When a cedar is affected by the cedar leafminer, the foliage turns from yellow to brown. Infested cedars can generally regenerate their foliage later in the growing season if proper maintenance practices are followed.
Here are some signs that may indicate your cedar has been affected:
- Yellowing or browning that begins at the tips of branches.
- Small feeding marks visible underneath cedar branches.
- Mined, translucent leaves found on branches.
- Small silver-coloured moths (the size of a small moth) flying away when the tree is shaken.
Why get rid of it?
The cedar leafminer can seriously affect the health of cedar hedges. Its larvae burrow into the foliage, causing leaves to yellow, dry out and fall. A severe infestation weakens the tree, making it more vulnerable to disease, and may even lead to the loss of the hedge if the problem persists from year to year.
How can you limit its presence?
Taking care of your cedars is essential to help them thrive, stay healthy and better resist potential infestations. Here are some recommended practices:
- Water your cedars during dry periods. Newly planted cedars should be watered frequently during the first growing season after planting. To ensure proper watering, you can use tools such as a soil moisture meter or an irrigation stick.
- Fertilize your cedars to support growth and strengthen their natural defenses. Prioritize nitrogen for growth, phosphorus for root development and potassium for overall tree health.
What should you do with the debris?
Never compost your clippings if you suspect an infestation.
Cedar trimmings must be completely collected, placed in bags and disposed of with household garbage.
