Modern Mississauga and the City of Mississauga have come together to present an ongoing series called “Ask the City.” We’ll share relevant information here and answer your questions about our city.

Today’s question is about LDD moth infestation. 

What is an LDD moth and how do I protect my trees from infestation?

LDD moth is a non-native and invasive species that can harm our trees by eating all its leaves. This can weaken trees and lead to disease. The caterpillars eat the leaves during the spring and early summer. They prefer oak trees but will eat the leaves of any hardwood tree such as ash, birch or elm. 

To help lower the population of LDD, from now until the end of April, residents can begin removing LDD egg masses found on their property.

Egg masses are oval in shape, are tan or bright yellow in colour and can range in size from a dime to larger than a toonie. LDD moths lay their eggs almost anywhere and can be found on trees, windowsills, under eaves, bird houses, mail boxes, patio furniture and more.

Follow these steps to destroy the egg mass:

1. Spray the mass with water to stop the egg mass from crumbling

2. Scrape the egg mass with a stick or object with a flat surface into a container or brown bag – scraping it on the ground will still allow the eggs to hatch

3. Place the egg mass into a bucket of soapy water and soak for a few days to destroy the eggs

For more information about LDD moths, visit: https://www.mississauga.ca/services-and-programs/forestry-and-environment/invasive-species/gypsy-moth/