Can anything kill the emerald ash borer?
The beetle’s natural enemies, like fungi and woodpeckers, aren’t enough to keep it in check. No insecticide has proven 100% effective. The only known way to destroy the pest is to destroy the tree. • Should I treat my ash tree with insecticides anyway? You can begin treating your ash tree, but there is a cost factor to consider. Regular applications of insecticide are recommended once a year, and the ash tree may still have to be taken down. Merit is one insecticide that has been partially successful in prolonging the life of the ash tree. Treatment of diseased trees is costly and will prolong the life of the tree for a few years. The cost of treatment is usually only justified when a tree has unusual symbolic value or fills an important place in the landscape.
