Comparison of the effects of neonicotinoids and pyrethroids against Oebalus pugnax (Hemiptera: Pentatomidae) in rice

Authors

  • Bryce Blackman International Rice Research Institute, Los Baños, Laguna, 4030, Philippines
  • Srinivas Lanka Dept. of Entomol., Louisiana State University Agricultural Center, Baton Rouge, LA 70803, USA and Bayer CropScience, Durham, NC 27709, USA
  • Natalie Hummel Texas A&M AgriLife Research and Extension Center, Beaumont, TX 77713, USA
  • Mo Way
  • Michael Stout Dept. of Entomol., Louisiana State University Agricultural Center, Baton Rouge, LA 70803, USA and Bayer CropScience, Durham, NC 27709, USA

Keywords:

dinotefuran, lambda-cyhalothrin, rice stink bug

Abstract

The rice stink bug, Oebalus pugnax (F.) (Hemiptera: Pentatomidae), is an economically important late-season pest of rice in the southern United States. Stink bug feeding results in yield reduction and discounted purchase price due to broken or discolored (“pecky”) rice grains. The primary tactic for O. pugnax management is the application of insecticides once adults reach an action threshold. Recent surveys show that pyrethroids are preferred by southern U.S. rice farmers over all other insecticides to reduce O. pugnax densities. However, preliminary tests in 2009 suggested resistance to pyrethroids may be developing in an O. pugnax population in Texas, where applications are more frequent than in other rice-growing areas. This study compared the effects of pyrethroids and neonicotinoids on O. pugnax behavior and mortality in the laboratory and in a number of field experiments conducted between 2011 and 2014. Results from these experiments showed that control of O. pugnax given by the neonicotinoid, dinotefuran, was similar to that given by pyrethroids in the laboratory and field. Results from small-plot field studies were influenced by movement of adult rice stink bugs from surrounding untreated plots, and the data from commercial-scale trials and from sampling of nymphs in small plots may provide more useful information on the efficacies of insecticides. Two experiments provided limited evidence for longer residual activity of dinotefuran compared to the pyrethroid λ-cyhalothrin, and a laboratory study showed that both insecticides reduced feeding activity of rice stink bugs. Tests also confirmed the increased tolerance of a Texas population of rice stink bugs to λ-cyhalothrin, suggesting the need for insecticides with different modes of action in the O. pugnax management program.

 

Resumen

El chinche de arroz, Oebalus pugnax (F.) (Hemiptera: Pentatomidae), es una peste de importancia economica al fin de la temporada del arroz en el Sur de los Estados Unidos. El daño causado por este insecto se presenta en forma descolorida (“pecosa”) o en grano trizado. Este problema entonces resulta en la reducción de produccion y por ende en un descuento en el costo de este arroz. La tactica principal para el manejo de O. pugnax es la aplicacion de insecticidas en cuanto los adultos hayan alcanzado una umbral de accion. Cuestionarios recientes muestran que los pyretroides son preferidos por los agricultores de arroz en el Sur de los Estados Unidos mas que otros insecticidas para reducir densidades O. pugnax. Sin embargo, experimentos preeliminares realizados en Texas en el 2009 sugieren un desarrollo en resistencia a pyretroides en una población O. pugnax en donde aplicaciónes son mas frecuentes que en otros sembrios de arroz. Este estudio realizado en algunos experimentos de laboratorio y campo entre los años 2011 y 2014 compara los efectos en el comportamiento y mortalidad de piretroides y neonicotinoides sobre O.pugnax Los resultados de laboratorio y de campo de estos experimentos muestran que el control de O. pugnax dados por neonicotinoides, dinotefuran fue parecida a la de los piretroides. Los resultados de sembrios pequenos que fueron influenciados por el movimineto del chinche de arroz adulto fue desde el alrededor de sembrios sin tratamiento, examenes de escala-comercial, y de experimentos con ninfas en sembrios pequenos. Estos resultados pueden proveer mas informacion que puede ser usada en cuanto a la eficacia de insecticidas. Dos experiementos proveyeron evidencia limitada de actividad larga de dinotefuran en comparacon con pyrethroid λ-cyhalothrin, y un experimento de laboratorio demostro que los dos insecticidas disminuyeron la actividad de alimentacion del chinche de arroz. Examenes tambien confirman el incremento en tolerancia de parte de una población de O. pugnax de Texas para con λ-cyhalothrin lo cual sugiere la necesidad adicional de insecticidas en el manejo del programa O. pugnax.

 

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Issue

Vol. 98, No. 1 (March 2015)

Section

Research Papers

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