Good Morning Cheryl, 

Thank you for contacting the U of M Extension Service. 

You indicated you had your tree treated three years ago. Have you had it treated since? It is my understanding that ash trees need to be treated at least once a year to avoid EAB. 

You stated your tree was diagnost with EAB three years ago and then you treated it after it was already infected? You treated the tree once? 

Here is a link to emerald ash borer from the U of M Extension Yard and Garden website: 

https://extension.umn.edu/tree-and-shrub-insects/emerald-ash-borer

I suggest you contact a certified arborist to re-evaluate your tree. It may be beyond saving at this point. https://extension.umn.edu/planting-and-growing-guides/how-hire-tree-care-professional

Good Luck!

Good Morning Cheryl, 

Thank you for contacting the U of M Extension Service. 

You indicated you had your tree treated three years ago. Have you had it treated since? It is my understanding that ash trees need to be treated at least once a year to avoid EAB. 

You stated your tree was diagnost with EAB three years ago and then you treated it after it was already infected? You treated the tree once? 

Here is a link to emerald ash borer from the U of M Extension Yard and Garden website: 

https://extension.umn.edu/tree-and-shrub-insects/emerald-ash-borer

I suggest you contact a certified arborist to re-evaluate your tree. It may be beyond saving at this point. https://extension.umn.edu/planting-and-growing-guides/how-hire-tree-care-professional

Good Luck!