First report of broad mite (Acari: Tarsonemidae) on commercial strawberry in Florida
Keywords:
cyclamen mite, acaricides, spiromesifen, pest management,Abstract
Summary
During the past 2 strawberry-growing seasons in Florida (Oct to Mar in 2015–2016 and in 2016–2017), broad mite, Polyphagotarsonemuslatus (Banks), was found on the upper sides of young strawberry leaves and on fruit. Damage symptoms were similar to those reported from other affected crops: leaf curl, browning and yellowing of leaf tissue and bronzing of ripening fruit, but less than 1% of plants in surveyed fields appeared to be affected. Broad mites were found in 1 field in 2015–2016 but in at least 5 fields in 2016–2017, indicating a possible increase in their potential to affect strawberry. Small areas of a field treated with Oberon 2 SC (spiromesifen) were sampled for broad mites. Post-application counts were generally lower than preapplication counts, although there was a high degree of intra-plant variability in counts. Future efforts should be directed at monitoring broad mite populations and their influence in strawberry and implementing management practices, if necessary, that have been effective in other crops.
Sumario
Durante las últimas 2 temporadas de la siembra de fresa en Florida (octubre a marzo del 2015-2016 y en el 2016-2017), el ácaro ancho, Polyphagotarsonemus latus (Banks), se encontró en la parte inferior de las hojas jóvenes y en la fruta. Los síntomas de daño fueron similares a los reportados de otros cultivos afectados: el enrollo de hojas, el bronceado y amarillamiento del tejido de las hojas y bronceado de la fruta madura, pero menos del 1% de las plantas en los campos estudiados parecían estar afectadas. Se encontró el ácaro ancho en 1 campo en el 2015-2016, pero en al menos 5 campos en el 2016-2017, lo que indica un posible aumento en su potencial para afectar a la fresa. Se muestrearon pequeñas áreas de un campo tratado con Oberon 2 SC (spiromesifen) para detectar el ácaro ancho. El conteo despues de la aplicación fue generalmente más bajo que el conteo antes de la aplicación, aunque hubo un alto grado de variabilidad dentro de la planta en el conteo. Los esfuerzos futuros deben estar dirigidos a monitorear las poblaciones del ácaro ancho y su influencia en la fresa y aplicar prácticas de manejo, si es necesario, que han sido eficaces en otros cultivos.
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