Susceptibility of tomato borer, Tuta absoluta (Meyrick) (Lepidoptera: Gelechiidae) populations from Turkey to 7 different insecticides in laboratory bioassay

Abstract

The tomato borer, Tuta absoluta (Meyrick), was first recorded in Turkey in August 2009 and rapidly became a serious pest in the Mediterranean and Aegean coastal regions in field and greenhouse grown tomatoes. Currently, insecticides are considered one of the major tools for the management of T. absoluta in Turkey. This study, investigated the efficacy of 7 different insecticides, against T. absoluta in laboratory bioassays. To determine the lethal concentration (LC) values and feeding activity of the larvae, tomato leaf parts mined by 1–3 day old L1 larvae were dipped into different insecticide concentrations. Mortality was recorded 5 days after insecticide treatments. Spinosad, chlorantraniliprole + abamectin or indoxacarb treatment resulted in 100% mortality with minimal or no feeding in all populations at their recommended doses of 120, 50.4 and 60 mg a.s. L−1, respectively. In general, the LC99 values of populations for these insecticides were similar and also lower than that of the recommended field doses. The effect of pyridalyl was low, resulting in low mortality with serious feeding damage at the dose of 125 mg a.s. L−1. The efficacies of abamectin, metaflumizone and azadirachtin were found to be moderate to low at the recommended doses (4.5, 240 and 50 mg a.s. L−1, respectively). However, these insecticides may affect pupation and adult emergence rates hence further studies are recommended to investigate these insecticides.

Growth inhibitory effects of bio- and synthetic insecticides on Tuta absoluta (Meyrick, 1917) (Lepidoptera: Gelechiidae)

“…According to the results of the field study, the researches denoted that spinosad was effective in controlling T. absoluta. Dağlı et al (2012) determined in a study investigated the efficiency of different insecticides on T. absoluta that spinosad and chlorantraniliprole+abamectin showed a hundred percent effect on the pest, but effects of metaflumizone and azadirachtin on the pest were lower. A study on management of T. absoluta with insecticides on tomatoes in both laboratory and greenhouse performed by showed that spinosad was effective in the ratio of 91% on T. absoluta.…”

The tomato leafminer, Tuta absoluta (Meyrick) (Lepidoptera: Gelechiidae):pupal key characters for sexing individuals

“…Given the importance of the pest, many studies (Stol et al, 2009) have been conducted to relate its biology (Pereyra and Sanchez, 2006;Doğanlar and Yiğit, 2011;Torres et al, 2011;Öztemiz, 2012), ecology, management (Giustolin et al, 2001;Silva et al, 2011;Dağlı et al, 2012), effects of X-rays (Cagnotti et al, 2012), and reproduction as parthenogenesis (Megido et al, 2012). In some of these studies it is important to have knowledge of T. absoluta pupal characters.…”

Resistencia a emamectina benzoato en Tuta absoluta (Meyrick) (Lepidoptera: Gelechiidae)

“…Conociendo que abamectina es menos eficaz que emamectina, factores de resistencia de 5,7 (Dağli et al, 2012), 8,9 (Silva et al, 2011) y 9,4 (Siqueira et al, 2001 en tuta a abamectina, se pueden considerar bajos, aunque siguen siendo más elevados que los que muestra cualquier población de tuta a emamectina (Tabla 4.1 y 4.2). Estos bajos niveles de resistencia a abamectina, pueden deberse a la baja dosis usada y a su rápida degradación (Clark et al, 1995).…”

“…Aún así, cabe destacar el rango de la CL 50 de dichas poblaciones de Grecia, el cual oscila de 31,8 a 159,5 ppm (Roditakis et al, 2013), valores considerablemente superiores a los observados en las tablas 4.3 y 4.4 (0,013-0,337 ppm). También son menos susceptibles a metaflumizona las poblaciones de Turquía ensayadas por Dağli et al, (2012), con un rango de la CL 50 de 153,2-1350 ppm y las estudiadas por Karaağaç (2015), con valores de 13,25 a 52,71 ppm, en poblaciones también turcas de tuta. A pesar de esos elevados valores de concentración letal, se vuelven a observar valores moderados de resistencia, 9 (Dağli et al, 2012) encuentran dentro del rango de valores de la CL 50 en poblaciones turcas de tuta, 10,9-88,1 ppm (Dağli et al, 2012).…”

“…También son menos susceptibles a metaflumizona las poblaciones de Turquía ensayadas por Dağli et al, (2012), con un rango de la CL 50 de 153,2-1350 ppm y las estudiadas por Karaağaç (2015), con valores de 13,25 a 52,71 ppm, en poblaciones también turcas de tuta. A pesar de esos elevados valores de concentración letal, se vuelven a observar valores moderados de resistencia, 9 (Dağli et al, 2012) encuentran dentro del rango de valores de la CL 50 en poblaciones turcas de tuta, 10,9-88,1 ppm (Dağli et al, 2012). Para una población de Brasil de tuta también se obtuvo el valor de 10,9 ppm (CL 50 ) frente a azadiractina (Tomé et al, 2013), valor que se encuentra entre Boavista (7,282 ppm) y Abarán (11,305 ppm).…”