10/14/2026
Some experts say Canada made one of the riskiest environmental decisions in modern history. Others say it was the only option left. Millions of tiny wasps, each smaller than a grain of rice, were released into Ontario's forests to stop an invader from Asia that was killing ash trees by the millions.
For decades, scientists had warned that bringing in one foreign species to fight another could backfire badly. Years later, a researcher peeled back a strip of bark and found something no one had planned for.
The wasps weren't staying where they were released. How far had they gone? What exactly were they hunting? And did anyone still control the outcome? Biological control remains one of the most debated tools in conservation.
Is it a calculated risk worth taking, or a gamble with nature we can't undo?
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