Líneas base, dosis diagnóstico y medición periódica de resistencia a imidacloprid, spinosad y carbosulfan en poblaciones de adultos de Thrips palmi (Thysanoptera: Thripidae en el Valle del Cauca, Colombia = Baseline data, diagnostic doses, and monitoring of resistance to imidacloprid, spinosad and carbosulfan in adult populations of Thrips palmi (Thysanoptera: Thripidae) in the Cauca Valley, Colombia
El trips del melon, Thrips palmi Karny, ha alcanzado gran importancia economica en habichuela, frijol, berenjena y pepino, entre otros cultivos, desde que se registro su presencia en Colombia, lo cual ha desencadenado el uso indiscriminado de insecticidas para su manejo. Con el fin de medir periodicamente los cambios en la susceptibilidad del insecto a algunos productos eficientes para su control, se establecieron las lineas base, los valores CL50 y CL90y las dosis diagnostico para imidacloprid, spinosad y carbosulfan sobre adultos de una poblacion de T. palmi susceptible mantenida en CIAT desde 1997. El imidacloprid se evaluo como insecticida sistemico por inmersion de hojas con peciolos en las soluciones del insecticida y colocacion del follaje, asi tratado, en cajas de petri con agar. Los insecticidas spinosad y carbosulfan se evaluaron como insecticidas de contacto usando la tecnica de inmersion de follaje. Los discos de follaje tratados se colocaron en cajas de petri con agar. Las dosis diagnostico fueron 1.000 ppm (imidacloprid), 2.000 ppm (spinosad) y 2.000 ppm (carbosulfan). Estas se usaron para medir periodicamente la resistencia a insecticidas en campo en cinco zonas del Valle del Cauca caracterizadas por excesivo uso de plaguicidas para el control de T. palmi. No se encontraron evidencias de resistencia a los insecticidas evaluados. Sin embargo, se recomienda realizar las mediciones periodicamente para detectar cambios de la resistencia en el tiempo. = The melon thrips (Thrips palmi) have become a very significant pest of snap beans, beans, eggplants and cucumbers, and other crops, since they were first reported in Colombia. The response of farmers to this problem has been the excessive pesticide use. With the aim of monitoring changes on the susceptibility of thrips populations to certain insecticides that are still effective, the line base data, LC50and LC90 values and diagnostic doses for imidacloprid, spinosad and carbosulfan were established. We used an adult population of a susceptible strain of T. palmi maintained at CIAT since 1997. Imidacloprid was evaluated as a systemic pesticide by immersing leaves with petioles in insecticide solutions. Disks of foliage treated in this fashion were placed on agar in petri dishes. Spinosad and carbosulfan were evaluated as contact pesticides using the foliage dipping technique. Disks of the treated foliage were placed on petri dishes with agar. The diagnostic doses were 1.000 ppm (imidacloprid), 2.000 ppm (spinosad) and 2.000 ppm (carbosulfan). These doses were used for field monitoring of resistance in five zones of the Cauca Valley where heavy use of pesticides for the control of T. palmi occurs. No evidence of resistance to any of the evaluated pesticides was found. Nevertheless, we recommended the performance of periodic monitoring in order to detect changes in resistance of the thrips over time.
| Main Authors: | , , , |
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| Format: | Journal Article biblioteca |
| Language: | Spanish / Castilian |
| Published: |
2003
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| Subjects: | thrips palmi, insecticides, resistance to chemicals, carbosulfan, insecticidas, resistencia a productos químicos, carbosulfán, |
| Online Access: | https://hdl.handle.net/10568/44351 http://ciat-library.ciat.cgiar.org/Articulos_Ciat/rodriguez2.pdf |
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