Trunk injections: A new and innovative technique for insecticide delivery in tree fruits

Trunk injection technology was tested for its effectiveness in protecting apple trees from direct and indirect insect pests. Two rates of imidacloprid and emamectin benzoate were injected in apple trees shortly after the apple petal fall stage. Field survey techniques were used to evaluate the control of an array of indirect apple pests, including potato leafhopper (Empoasca fabae), oblique banded leafroller (Choristoneura rosaceana), spotted tentiform leafminer (Phyllonorycter blancardella), oriental fruit moth (Grapholitha molesta), japanese beetle (Popillia japonica), and green apple aphid (Aphis pomi). Bioassays were used to assess mortality of oblique banded leaf roller and plum curculio (Conotrachelus nenuphar). Leaf and fruit samples were taken for residue analysis post injection using GCMS and HPLC. This method of insecticide delivery may prove to be an economical and environmentally safe alternative to ground sprayers. It is expected to eliminate concerns about pesticide drift, worker exposure and negative impacts on beneficial insects.