Susceptibility of Bactericera cockerelli Sulc (Hemiptera: Triozidae) nymphs to Sivanto 200 SL (flupyradifurone)
Keywords:
potato psyllid, butenolide, susceptibility, antifeedant effect,Abstract
Sivanto 200 SL (flupyradifurone) was recently introduced into the Mexican market for the control of Bactericera cockerelli Sulc (Hemiptera: Triozidae) in different solanaceous crops such as potato, tomato, and pepper, which are important crops in Mexico. The objective of this study was to determine the toxicity of flupyradifurone on 5th instar potato psyllids in 3 field-collected populations and a laboratory susceptible one. There were no differences in susceptibility to flupyradifurone among the evaluated populations. The lethal concentration values (LC) at 50% of mortality ranged from 243.2 to 368.1 mg per L at 24 h, after 48 h of exposure, LC50 values were between 51.0 to 62.5 mg per L. The LC95 values at 24 h ranged from 2403 to 5265 mg per L, and at 48 h of exposure were between 506.5 to 936.9 mg per L. The relative toxicity (RT) at 50% of mortality was 4.07 to 4.97 times higher after 48 h than after 24 h. Moreover, an antifeedant effect associated with flupyradifurone decreased the amount of excreta after 24 h of feeding by 51, 42, and 75% at the flupyradifurone dosages of 30, 50, and 100 mg per L, respectively, relative to the untreated control.
Resumen
Sivanto 200 SL (flupyradifurone) fue introducido al mercado en México en el 2015, recomendado para el control de Bactericera cockerelli Sulc (Hemiptera: Triozidae) en diferentes solanáceas como papa, jitomate y chile, cultivos de importancia en México. El objetivo de esta investigación fue determiner la toxicidad de flupyradifurone sobre ninfas de 5to instar de paratrioza en tres poblaciones de campo y una susceptible de laboratorio. Los resultados no mostraron diferencias en la respuesta a flupyradifurone entre las poblaciones evaluadas. Los valores de la concentración letal (CL) al 50% de mortalidad variaron de 243.2 a 368.1 mg por L a las 24 h, después de 48 h de exposición, los valores de CL50 variaron de 51.0 a 62.5 mg por L. Los valores de CL95 a las 24 h variaron de 2403 a 5265 mg por L, y a las 48 h de exposición entre 506.5 y 936.9 mg por L. La toxicidad relativa al 50% de mortalidad fue de 4.07 a 4.97 veces mayor a las 48 h respecto a las 24 h. Así mismo, se observó una reducción en el número de excretas asociada con un efecto antialimentario a las 24 h en un 51, 42 y 75% a las dosis de 30, 50 y 100 mg por L respectivamente de flupyradifurone en relación al control.
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