Wisconsin Alert: Emerald Ash Borer Threatens Trees, Now Detected in 98% of Counties


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Madison, WI – The Emerald Ash Borer (EAB), an invasive insect, has now been detected in 71 of Wisconsin’s 72 counties, signaling a widespread threat across the state. 

This detection rate underscores the urgency in addressing the pest that targets various species of ash trees, including white, black, and green ash. Notably, this does not imply that 98% of trees are infested, but rather that 98% of counties have reported the presence of the beetle.

Residents are encouraged to combat this threat by using approved insecticides such as imidacloprid, dinotefuran, emamectin benzoate, or azadirachtin. Treatments should be applied to the soil at the base of the trees during the optimal seasons of spring or fall. The University of Wisconsin-Madison emphasizes the importance of early intervention before significant canopy thinning occurs, enhancing the effectiveness of treatments.

For more information on EAB and management strategies, homeowners can refer to the University of Wisconsin Garden Facts or consult with certified arborists. It’s crucial to carefully select and apply treatments to ensure the health of valuable ash trees and curb the spread of this destructive pest.


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