The friendly neighbourhood elm spanworm is out in full force, chewing the leaves of every tree it can crawl onto and suspending in hordes from sticky, silky strings. The only way to fight the crawlers is to spray the tree leaves with a special bacteria. It's harmless to other bugs and animals, but once the elm spanworm larvae ingest it, they'll die in less than a week. The city sprays a bacteria onto the tree leaves, which the elm spanworm will then ingest, killing it in a number of days. Unlike other caterpillars, the adult female elm spanworm can fly when she becomes a moth.

Source: CBC News June 25, 2020 01:05 UTC