Toward pheromone-based mating disruption of Enarmonia formosana (Lepidoptera : Tortricidae) on ornamental cherry trees

The potential for pheromone-mediated mating disruption of the cherry bark t ortrix (CBT), Enarmonia formosana (Scopoli), was evaluated by attaching PVC tube dispensers to the trunks of mature (>40 cm diameter at breast height) ornamental cherry trees, Prunus cvs., Lining suburban streets of New Westm inster and Vancouver, British Columbia. Dispensers released either a blend of (E)-9-dodecenyl acetate (E9-12:OAc, 49.5%), (Z)-9-dodecenyl acetate (Z9- 12:OAc, 49.5%), and (2)-7-decenyl acetate (Z7-10:OAc, 1%) at a rate of 29 m g/day (Exp. 1), or E9-12:OAc alone at 27 mg/day (Exp. 2), 4 mg/day (Exp. 3) , or 0.5 mg/day (Exp. 4). A sticky Delta trap baited with a grey rubber sep tum impregnated with CBT pheromone components E9-12:OAc (40 mu g), Z9-12:AO c (60 mu g), and Z7-10:OAc (1 mu g) was placed in each tree. Captures of ma le CBTs in treatment trees were significantly reduced compared with control trees in all experiments. Results suggest that disruption of pheromone-bas ed communication in CBT around individual cherry trees is feasible with a p heromone blend or with E9-12:OAc alone, and could become part of an integra ted management strategy for CBT in urban environments.