Haroldo Xavier Linhares Volpe, Fundo de Defesa da Citricultura (Fundecitrus); MURILO FAZOLIN, CPAF-AC; Rafael Brandão Garcia, Fundo de Defesa da Citricultura (Fundecitrus); José Carlos Barbosa, Universidade Estadual Paulista; Marcelo Pedreira Miranda, Fundo de Defesa da Citricultura (Fundecitrus).2026-06-30http://hdl.handle.net/123456789/368904Insecticide application is the main way to control Diaphorina citri. However, it causes environmental contamination, has a negative impact on beneficial organisms, and leads to psyllid resistance. The essential oil of Piper aduncum has low toxicity towards the environment and contains dillapiol, which was proven to be effective against several crop pests. Here, we studied its efficacy against nymphs and adults of D. citri under laboratory conditions. Oils with three concentrations of dillapiol (65.2%, 76.6%, and 81.6%) at 0.5%, 0.75%, and 1.0% dilutions plus 0.025% adjuvant were tested. All treatments caused 90?100% mortality in nymphs. Topical treatments with oil containing 76.6% and 81.6% of dillapiol at 0.75% and 1% dilutions were effective (mortality less or equal 80%) in adults. However, the essential oil showed no residual activity against adults (mortality bigger or equal 30%). Because of its high efficacy against nymphs and adults, P. aduncum is a promising botanical insecticide for use in integrated pest management of D. citri.3 p.openAccessDillapiolHuanglongbing (HLB)Enfermedad del dragón amarilloAceites esencialesEnfermedades y desórdenes de las plantasInsecticidas botánicosNinfas (larvas)Vectores de insectosAsian citrus psyllidDoença de plantaFruta cítricaInsetoVetorInseticida de origem vegetalÓleo essencialNinfaPlant diseases and disordersPiper aduncumCitrusCandidatus liberibacterInsect vectorsDiaphorina citriNymphsGreening diseaseBotanical insecticidesEssential oilsResumo em anais e proceedings