Aphid and mite infestations on the foliage of commercial pecan trees cause significant, recurring losses in nut production and significant progress has been made in combining biological and chemical control tactics to prevent outbreaks. Research results are reported on the efficacy of selective aphidicides (pymetrozin and thiamethoxam) and a selective miticide (bifenazate) in a pecan orchard where biological controls (ladybeetles, lacewings and phytoseiid mites) are in place. The benefits are weighed against the costs of control.