Effect of duration of deployment on parasitism and predation of Halyomorpha halys (Stål) (Hemiptera: Pentatomidae) sentinel egg masses in various host plants

Authors

  • Glynn Tillman USDA, ARS, Southeast Watershed Research Laboratory, Tifton, Georgia 31793, USA
  • Ted Cottrell USDA, ARS, Southeastern Fruit & Nut Tree Research Laboratory, Byron, Georgia 31008, USA
  • Rammohan Balusu Auburn University, Department of Entomology and Plant Pathology, Auburn, Alabama 36849, USA
  • Henry Fadamiro Auburn University, Department of Entomology and Plant Pathology, Auburn, Alabama 36849, USA
  • David Buntin University of Georgia, Department of Entomology, Griffin, Georgia 30223, USA
  • Ashfaq Sial University of Georgia, Department of Entomology, Athens, Georgia 30602, USA
  • Edgar Vinson Auburn University, Department of Horticulture, Auburn, Alabama 36849, USA
  • Michael Toews University of Georgia, Department of Entomology, Tifton, Georgia 31793, USA
  • Dilani Patel University of Georgia, Department of Entomology, Tifton, Georgia 31793, USA
  • Erin Grabarczyk USDA, ARS, Southeast Watershed Research Laboratory, Tifton, Georgia 31793, USA

Abstract

The invasive brown marmorated stink bug, Halyomorpha halys (Stål) (Hemiptera: Pentatomidae), is an agricultural and nuisance pest in Georgia and Alabama, USA. Natural enemies may provide significant suppression of the brown marmorated stink bug, and sentinel egg masses are deployed commonly on plants in the field to measure their effects. The objective of this study was to evaluate the effect of deployment duration (2–5 d) on parasitism and predation of brown marmorated stink bug sentinel egg masses in plum, peach, blueberry, tomato, sassafras, corn, and soybean in these 2 states. Retrieved egg masses were processed to quantify rates of predation and parasitism and identify parasitoid species and predation types. Across crops, predation and parasitism were higher significantly in plum at 5 d compared to 2 d deployment but was similar in soybean regardless of exposure time in 2017. Predation and parasitism were higher significantly after 5 d of exposure compared to 2 d and 3 d whereas parasitism was significantly higher at 3 d compared to 2 d exposure in 2018 to 2020. For individual crop trials, though, effects of time of exposure were tested in different yr, sampling dates, and crops with variable results. When significant differences were detected for parasitism in plum, peach, tomato, and sassafras, a 5 d deployment resulted in higher parasitism compared to 2 d. Given the variability of factors that affect parasitism and predation under field conditions, we conclude that a 5 d deployment is optimal and a 3 d exposure time is minimal for assessing predation and parasitism. An additional benefit for a 5 d exposure is that it increases the probability of detecting hyperparasitism.

Resumen

El chinche marmorino café, Halyomorpha halys (Stål) (Hemiptera: Pentatomidae), es una plaga agrícola invasora y molesta en los Estados de Georgia y Alabama, EE. UU. Los enemigos naturales pueden proporcionar una supresión significativa del chinche marmorino café y las masas de huevos centinelas se colocan comúnmente en las plantas en el campo para medir sus efectos. El objetivo de este estudio fue evaluar el efecto de la duración del despliegue (2 a 5 días) sobre el parasitismo y la depredación de las masas de huevos centinelas del chinche marmorino café en ciruela, melocotón, arándano, tomate, sasafrás, maíz y soja en estos dos Estados. Las masas de huevos recuperadas se procesaron para cuantificar las tasas de depredación y parasitismo e identificar las especies de parasitoides y los tipos de depredación. En todos los cultivos, la depredación y el parasitismo fueron significativamente más altos en ciruela a los 5 días en comparación con el despliegue de 2 días, pero fue similar en la soja independientemente del tiempo de exposición en el 2017. La depredación y el parasitismo fueron significativamente más altos después de 5 días de exposición en comparación con 2 días y 3 días, mientras que el parasitismo fue significativamente mayor también a los 3 días en comparación con la exposición a los 2 días desde el 2018 al 2020. Sin embargo, para los ensayos de cultivos individuales, los efectos del tiempo de exposición se probaron en diferentes años, fechas de muestreo y cultivos con resultados variables. Cuando se detectaron diferencias significativas para el parasitismo en ciruela, melocotón, tomate y sasafrás, el despliegue de 5 días resultó en un mayor parasitismo en comparación con 2 días. Dada la variabilidad de los factores que afectan el parasitismo y la depredación en condiciones de campo, concluimos que un despliegue de 5 días es óptimo y un tiempo de exposición de 3 días es mínimo para evaluar la depredación y el parasitismo. Un beneficio adicional de la exposición de 5 días es que aumenta la probabilidad de detectar hiperparasitismo.

Key Words: brown marmorated stink bug; parasitism; predation; Trissolcus; Anastatus; Ooencyrtus

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Published

2022-04-08

Issue

Vol. 105, No. 1 (March 2022)

Section

Research Papers

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