Spongy moth caterpillars are a serious threat to oaks and other trees in Chicago area

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The moths have been spreading steadily through North America since the 1860s, when they were imported as part of a failed effort to begin a silkworm industry.

There will be some very confused moths this summer in some parts of Cook, DuPage, Kane, Kendall and other Illinois counties. And that’s good news for trees.

Their voracious caterpillars have caused widespread damage to forests, parks and trees in streets and yards. If you think you have spongy moth caterpillars in a tree, Adams suggested tying a strip of fabric around the trunk as a trap. “The caterpillars come down out of the canopy at night,” she said. “And they will go underneath the fabric band. In the morning, you can squish them.”

 

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