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What invasive caterpillars are doing to our lakes and streams


You don't have to tell anyone in Ontario or Quebec about the damage that can be done by Lymantria dispar, also known to some as gypsy moth caterpillars.

The invasive species ate its way through Central Canada this summer, gobbling up all the leaves they could find.

In addition to terrorizing trees, though, the caterpillars left a lesser-known problem for local waterways.

In this week's Riskin Report, CTV News Science and Technology Specialist Dan Riskin explains what scientists have just learned about how Lymantria dispar can affect the careful chemical balance of lakes and streams.

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Trudeau's speech to union delegates took aim at Conservatives

Prime Minister Justin Trudeau's trip to the United States targeted U.S. lawmakers, but also his political opponents in Canada, as his speech to one of the largest unions in North America attempted to make the case that his party cares more about workers’ rights than Pierre Poilievre’s Conservatives.

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