Comparison of attractants, insecticides, and mass trapping for managing Drosophila suzukii (Diptera: Drosophilidae) in blueberries
Abstract
The spotted wing drosophila, Drosophila suzukii Matsumura (Diptera: Drosophilidae), is a serious economic threat to the small fruit industry. Although there has been progress on identifying new insecticides for use against D. suzukii in berry crops, growers often reach the seasonal maximum use allowed for key insecticides, and there are issues with long pre-harvest intervals. The use of border sprays and mass trapping targets D. suzukii immigration into the field, reducing damage to fruits, and the amount of pesticides used. The purpose of this study was to investigate novel alternatives to conventional insecticide techniques for management of D. suzukii in blueberries. In laboratory bioassays, captures of adult D. suzukii were similar for yeast + sugar bait, wine + apple cider vinegar bait, and the commercially available RIGA® bait. In the field, more adult D. suzukii were collected in yeast bait traps placed in the control and alternative row spray treatments over the sampling period, compared with mass trapping and border spray treatments. In addition, more D. suzukii were reared from blueberries collected in the control treatment compared with berries collected in the border spray treatment. Our study provided evidence that border sprays and mass trapping could be an effective and sustainable alternative to conventional spraying techniques for controlling D. suzukii in blueberries. Also, we recommend spacing traps approximately 2 m apart to effectively manage D. suzukii immigration into blueberry fields.
Resumen
La drosophila de ala manchada, Drosophila suzukii Matsumura (Diptera: Drosophilidae), es una amenaza económica seria para la industria de frutas pequeñas. Mientras que se ha avanzado en identificar nuevos insecticidas para el uso contra D. suzukii en cultivos de bayas, los cultivadores a menudo alcanzan el uso máximo estacional permitido para los insecticidas clave y existen problemas con los largos intervalos de precosecha. El uso de aerosoles en los bordes del campo y la captura masiva de D. suzukii estan enfocados en la inmigración de la plaga al campo, reduciendo el daño a las frutas y la cantidad de pesticidas utilizados. El propósito de este estudio fue investigar alternativas novedosas a las técnicas de insecticidas convencionales para el manejo de D. suzukii en arándanos. En los bioensayos de laboratorio, la captura de adultos de D. suzukii fue similar para levadura + cebo de azúcar, vino + vinagre de sidra de manzana, y el cebo RIGA® disponible comercialmente. En el campo, se recolectaron más adultos de D. suzukii en trampas de cebo de levadura colocadas en el control y en tratamientos alternativos de rociado por hileras durante el período de muestreo en comparación con los tratamientos de la captura masiva y el rociado de borde. Además, se criaron más D. suzukii de arándanos recolectados en el tratamiento de control en comparación con las bayas recolectadas en el tratamiento de rociado en el borde. Nuestro estudio proporcionó pruebas de que las fumigaciones en los bordes del campo y la captura masiva podrían ser una alternativa eficaz y sostenible a las técnicas de pulverización convencionales para controlar D. suzukii en arándanos. Además, recomendamos separar las trampas de captura a una distancia de aproximadamente 2 m para manejar en una manera efectiva la inmigración de D. suzukii en los campos de arándanos.
Key Words: spotted wing drosophila, berry crops, border sprays, baits, mass trapping
View this article in BioOne https://doi.org/10.1653/024.102.0205
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