Healthy trees don’t attract borer attacks


Colorado State University Extension entomologist W. S. Cranshaw indicates that imidacloprid “is not effective against any of the borers that develop into moths (e.g. clearwing borers, carpenterworms, Dioryctria spp.) nor against species that tunnel into the heartwood of the tree (e.g., roundheaded borers)” despite these borers being listed on the product label.