A maximum concentration bioassay to assess insecticide efficacy against hemipteran pests of tomato

Authors

  • Bruno Rossitto De Marchi University of Florida, Department of Entomology, Wimauma, Florida 33598, USA
  • Megan Hennessey University of Florida, Department of Entomology, Wimauma, Florida 33598, USA
  • William Turechek USDA ARS, US Horticultural Research Laboratory, Fort Pierce, Florida 34945, USA
  • Hugh A. Smith University of Florida, Department of Entomology, Wimauma, Florida 33598, USA

Abstract

Hemipterans have resurged as a pest of tomato in south Florida. To determine if the problem was related to insecticide efficacy, populations of southern green stink bug (Nezara viridula [L.]; Hemiptera: Pentatomidae), brown stink bug (Euschistus quadrator Rolston; Hemiptera: Pentatomidae), and a leaf-footed bug (Leptoglossus phyllopus [L.]; Hemiptera: Coreidae) were collected from 8 commercial tomato farms in South Florida, and third instar nymphs were subjected to a maximum concentration bioassay. Insects from the F1 generation were confined in plastic containers with grape tomatoes treated with the highest labeled application rate of 6 insecticides commonly used for hemipteran management in tomatoes: bifenthrin, lambda-cyhalothrin, zeta-cypermethrin (pyrethroids), dinotefuran, imidacloprid, and thiamethoxam (neonicotinoids). Mortality was observed after 72 h. Bifenthrin was the most effective pyrethroid with mortality ranging from 73 to 100%. Dinotefuran was the most effective neonicotinoid with mortality ranging from 47 to 87%. In contrast, imidacloprid produced consistently poor results, with mortality ranging from 0 to 60%. Populations varied in their susceptibility to insecticides tested, but tests did not reveal evidence of lack of insecticide efficacy.

 

Sumario

Los hemipteranos han resurgido como plaga del tomate en el sur de Florida. Para determinar si el problema estaba relacionado con la eficacia de los insecticidas, se recolectaron poblaciones del chinche hediondo verde del sur (Nezara viridula [L.]; Hemiptera: Pentatomidae), el chinche hediondo café (Euschistus quadrator Rolston; Hemiptera: Pentatomidae) y un chinche de patas laminadas (Leptoglossus phyllopus [L.]; Hemiptera: Coreidae) de 8 granjas de tomate comerciales en el sur de Florida, y las ninfas de tercer estadio se sometieron a un bioensayo de concentración máxima. Los insectos de la generación F1 se limitaron en recipientes de plástico con tomates de uva tratados con la tasa de aplicación más alta etiquetada de 6 insecticidas comúnmente utilizados para el manejo de hemipteranos en tomates: bifentrina, lambda-cyhalothrin, zeta-cypermetrin (piretroides), dinotafurán, imidacloprida y thiametoxamam (neonicotinoides). La mortalidad se observó después de 72 horas. La bifentrina fue el piretroide más efectivo con mortalidad que varió del 73 al 100%. DinoteFuran fue el neonicotinoide más efectivo con mortalidad que varió del 47 al 87%. En contraste, el imidacloprid produjo resultados consistentemente pobres, con mortalidad que varía de 0 a 60%. Las poblaciones variaron en su susceptibilidad a los insecticidas probados, pero las pruebas no revelaron evidencia de falta de eficacia de insecticidas.

Key Words: Nezara viridula; Euschistus quadrator; pyrethroid; neonicotinoid

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Published

2023-07-17

Issue

Vol. 106, No. 2 (June 2023)

Section

Scientific Notes

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