Ash borer crawls into Osceola County

96 Iowa counties now reporting infestations


January 26, 2023


The adult beetles feed on ash leaves, causing very little damage. It is the cumulative damage by larval feeding (pictured) on the inner bark that eventually kills ash trees.

An invasive green beetle has made its way to another northwest Iowa county.

The Iowa Department of Agriculture and Land Stewardship on Jan. 19 confirmed that an infestation of the emerald ash borer (EAB) was discovered in Melvin. In addition to Osceola County, state officials also announced Monday the invasive pest was found in Monona and Woodbury counties.

Since its original detection in 2010, the invasive, ash tree-killing insect has now been confirmed in all but three of Iowa's 99 counties – Emmet, Palo Alto and Plymouth. The beetle last winter was confirmed to have made its way to O'Brien...

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