Control de machos de Choristoneura rosaceana (Harris) y Pandemis pyrusana Kearfott (Lepidoptera: Tortricidae) en huertos de manzanos del Estado de Washington (EE.UU.) tratados con diferentes densidades de varias formulaciones atracticidas

This is the first report on attracticides loaded with 1.6 or 16% pheromone, with or without 6% permethrin, tested for Choristoneura rosaceana (Harris) and Pandemis pyrusana Kearfott male control. Different densities of attracticide sources (750-3,600 droplets ha-1) homogeneously applied on the canopy were compared in apple (Malus pumila Mill.) orchards. Before attracticide application, no differences in male captures using pheromone baited trap were observed. Afterwards, a significant reduction of captures occurred along with the increasing pheromone concentration, when larger density sources were used. The addition of permethrin into the attracticide formulation, however, did not significantly improve the reduction of males. Overall, these results suggest that mating disruption or other mechanism, instead of the killing effect attributed to attracticides, controlled males. The attracticide formulations matrix reported is suggested to be tested as an alternative to the current ones used for mating disruption. It is suggested to test the attracticide formulation matrix reported as an alternative to the current ones used for mating distuption.\uc9ste es el primer informe del control de machos de Choristoneura rosaceana (Harris) y Pandemis pyrusana Kearfott con atracticidas que contengan 1,6 \uf3 16% de feromona, con o sin permetrina al 6%. Se compararon diferentes densidades de atracticidas (750-3.600 gotas ha-1), aplicadas homog\ue9neamente en la copa de los manzanos (Malus pumila Mill.). Antes de los tratamientos no se observaron diferencias estad\uedsticas en las capturas en trampas cebadas con feromona. Despu\ue9s de aplicar los tratamientos, se observ\uf3 una reducci\uf3n significativa en las capturas, al usar mayores concentraciones de feromona y mayores densidades de gotas por hect\ue1rea. La incorporaci\uf3n de permetrina en la formulaci\uf3n atracticida no mejor\uf3 su actividad en el control de machos. En general, los resultados sugieren que un efecto similar a la confusi\uf3n de c\uf3pula, en lugar de un efecto letal atribuible al atracticida, o bien otro mecanismo, control\uf3 a los machos de estas especies. La matriz grasosa usada en la formulaci\uf3n atracticida se sugiere como una alternativa para ser probada respecto de las formulaciones actualmente usadas para confusi\uf3n de c\uf3pula