[en] A risk map for the Tomato spotted wilt virus (TSWV) was elaborated for the main Portuguese processing tomato producing region, the "Ribatejo e Península de Setúbal" region, where periodically this virus causes severe losses. Forty nine tomato fields were monitored. Risk factors for TSWV infection were identified and quantified according to their relative importance in TSWV incidence. The risk factors considered for each field were: (1) presence of TSWV in the crop plants; (2) presence of TSWV in weeds which are hosts of TSWV vectors; (3) presence of TSWV vector thrips; (4) presence of TSWV host crops previously (in the two years before), namely, tomato, potato and sweet pepper; (5) presence of greenhouses, urban areas or TSWV host crops next to the field (up to about 100m from its borders). A risk estimator was calculated for each field. Among the thrips (Thysanoptera) identified, belonging to 11 genera, four vector thrips species were detected: Frankliniella occidentalis (Pergande) and Thrips tabaci Lindman, the two most abundant ones, and F. intonsa (Trybom) and F. schultzei (Trybom). Blue sticky traps placed up to about 75 cm above the crop canopy caught F. occidentalis and T. tabaci more efficiently than the beating technique. The weeds Datura stramonium L., Arctotheca calendula (L.), and Conyza bonariensis (L.) were identified as TSWV winter repositories. This study proposes a methodology to be used by field technicians for the annual evaluation of TSWV risk at a regional level, for an improved planning of processing tomato crop in the following season.

[es] Se ha elaborado un mapa de riesgos de incidencia del Tomato spotted wilt virus (TSWV) para la regi&oacute;n del Ribatejo y Pen&iacute;nsula de Set&uacute;bal, la m&aacute;s importante productora de tomate de Portugal, y donde, peri&oacute;dicamente, el virus ocasiona importantes p&eacute;rdidas. Se monitorizaron 49 parcelas de tomate al aire libre. Los factores de riesgo de infecci&oacute;n por TSWV se identificaran y cuantificaran en base a su importancia relativa en la incidencia de la virosis: (1) presencia de TSWV en el cultivo de tomate; (2) presencia de TSWV en las hierbas adventicias hospedadores de los trips vectores; (3) presencia de trips vectores de TSWV; (4) presencia de cultivos hospedantes de TSWV previos (en los dos a&ntilde;os anteriores), como tomate, patata y pimiento; y (5) presencia de invernaderos, &aacute;reas urbanas o cultivos hospedantes de TSWV en las proximidades (menos de 100 m de los bordes de las parcelas). Se estim&oacute; el riesgo de infecci&oacute;n para cada parcela. Se detectaron cuatro especies de trips (Thysanoptera) vectoras del virus: Frankliniella occidentalis (Pergande) y Thrips tabaci Lindman, las m&aacute;s abundantes y F. intonsa (Trybom) y F. shultzei (Trybom), en menor proporci&oacute;n. Datura stramonium L., Arctotheca calendula (L.) y Conyza bonariensis (L.) act&uacute;an como reservorios invernales de TSWV. Se propone una metodolog&iacute;a de evaluaci&oacute;n del riesgo de infecci&oacute;n del tomate por TSWV a escala regional, que ayude a los t&eacute;cnicos de campo a establecer las estrategias del cultivo de tomate en la siguiente campa&ntilde;a de cultivo.