The bronze birch borer is a contributing factor in birch dieback. It is believed that host condition has a major influence on the development of the borer. We found that the host tree's apparent condition does not appear to influence post first instar development.
Ball, John and Simmons, Gary
"The Influence of Host Condition on Post First Instar Development of the Bronze Birch Borer, Agrilus Anxius (Coleoptera: Buprestidae),"
The Great Lakes Entomologist, vol 19
Available at: https://scholar.valpo.edu/tgle/vol19/iss2/4