A second infestation of the emerald ash borer, a pest already blamed for killing millions of trees across the Midwest, has been discovered in Illinois, authorities announced Thursday.

Word that the metallic-green beetle was found in Wilmette, a north suburb of Chicago, comes a month after Illinois’ first case was detected in Kane County.

The small, nonnative beetle, which feeds on the leaves and wood of ash trees, was found this week in a yard by a Wilmette resident who alerted the Village Forestry Department, the Illinois Department of Agriculture said in a statement.

Local and state inspectors discovered more than a dozen trees in a five-block area of Wilmette showing symptoms of ash borer infestation, according to the agriculture department, which added that infected trees are cut down in most instances.

Wilmette parkways feature more than 2,800 ash trees and the community’s village president, Chris Canning, called the emerald ash borer “a serious threat to our residences and landscapes.”

The emerald ash borer is blamed for the loss of nearly 20 million trees in Indiana, Ohio, Michigan and neighboring Ontario since it first was found near Detroit in 2002. It is believed to have found its way from China to the United States in shipping crates, possibly as long as 15 years ago, forestry officials have said.

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