Avermectin Trunk Injections: A Promising Approach for Managing the Walnut Husk Fly (Rhagoletis completa)

This study examined the larvicidal effect of trunk-injected abamectin and emamectin benzoate against walnut husk fly (Rhagoletis completa Cresson, 1929). Walnut trees in two locations years were injected with pesticides at different concentrations. For toxicokinetic studies, active ingredient content was measured leaves, flowers, husks, kernels, using a UHPLC-MS/MS analytical method. The infestation rates between 3 70% 10 34% for benzoate, respectively, much lower compared to those control. showed positive correlation effect. injections had measurable but unsatisfactory insecticidal second year, when economic threshold exceeded. Trace amounts ingredients detected flowers. residue analysis declining concentration trend leaves over time. largest quantities (≤439 ng/g abamectin; ≤19,079 benzoate), concentrations husks orders magnitude (≤5.86 ng/g; ≤50.19 ng/g). measurements no above MRLs either fresh or dried kernels. results indicate that trunk abamectin, as well have potential suppress populations.