Field Evaluation of Petroleum Spray Oil and Carbaryl Against Tetranychus marianae (Acari: Tetranichidae) on Eggplant

Authors

  • Gadi V. P. Reddy Western Triangle Agricultural Research Center, Montana State University, 9546 Old Shelby Rd., Conrad, MT 59425, USA
  • Ross H. Miller Western Pacific Tropical Research Center, College of Natural and Applied Sciences, University of Guam, Mangilao, Guam 96923, USA

Keywords:

integrated control, Tetranychus marianae, carbaryl, petroleum spray oil, eggplant

Abstract

Tetranychus marianae McGregor (Acari: Tetranychidae) is a pest of several perennial crops and is widespread in the Pacific Basin, including the Mariana Islands where it was first reported. The mite is also present in the West Indies, Bahamas, southern USA, Nicaragua, Argentina, Brazil and Southeast Asia. Eggplant growers apply carbaryl 10 to 15 times against this pest during each cropping period. Some growers no longer cultivate eggplant and tomato because of uncontrollable mite infestations. Previous indoor studies have shown petroleum spray oil (PSO) to be effective against T. marianae. We therefore examined the comparative effectiveness of PSO (Sun-spray 6E®) at the rate of 5mL/liter, and carbaryl at the rate of 1.5 mL/liter, against T. marianae on eggplant at 2 locations in Guam. The mean percentages of mite infested leaves and the population densities of T. marianae at both the locations were significantly higher in control plots than in treatment plots. PSO treatments with 6 and 15 sprays more effectively reduced the number of T. marianae-infested leaves and populations of T. marianae than carbaryl treatments. Marketable yields of eggplant from PSO treated plots were significantly higher than from the other plots. We recommend 6 applications of PSO at 15, 25, 35, 45, 55 and 65 days of after transplanting for managing T. marianae on eggplant.

 

Tetranychus marianae McGregor (Acari: Tetranychidae) es una plaga de varios cultivos perennes y está muy extendida en la Cuenca del Pacífico, incluyendo las Islas Marianas, desde donde se informó por primera vez. El ácaro también está presente en las Antillas, Bahamas, el sur de Estados Unidos, Nicaragua, Argentina , Brasil y el sudeste de Asia. Los productores de berenjena se aplican carbaril de 10 a 15 veces durante cada período de cultivo. Como resultado, algunos productores ya no cultivan berenjena y tomate, debido a las infestaciones por ácaros incontrolables . Los estudios anteriores han demostrado interiores aceite en aerosol de petróleo (PSO) para ser eficaz contra T. marianae. Tanto, nuestro estudio la efectividad comparativa de PSO (Sun -spray 6E ®), a razón de 5mL/liter y carbaril a razón de 1.5 mL / litro, frente a T. marianae de berenjena en dos localidades de Guam. La media del porcentaje de hojas infestadas de ácaros y la densidad de población de T. marianae tanto en los lugares fueron significativamente mayores en las parcelas de control que en las parcelas de tratamiento. Tratamientos PSO con seis y quince sprays de manera más eficaz el número de hojas de T. marianae infestadas y las poblaciones de T. marianae que los tratamientos carbaril . Los rendimientos negociables de berenjena de PSO parcelas tratadas fueron significativamente más altos que los de las otras parcelas. Recomendamos seis aplicaciones de PSO a los 15, 25, 35, 45, 55 y 65 días de después del trasplante de la gestión T. marianae en berenjena.

 

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Published

2014-04-06

Issue

Vol. 97, No. 1 (March 2014)

Section

Research Papers

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