A tiny but destructive invasive insect poses a significant threat to ash trees. Over a billion ash trees are at risk due to the spread of this insect. The fight to stop the spread has been ongoing for more than 15 years.

The invasive insect in question is the emerald ash borer. Further details about the threat and the efforts to combat it are available from the source.

The source provides more information about the situation and the ongoing battle to protect the ash trees from this invasive insect.