Direction and timing of dispersal of Scirtothrips dorsalis (Thysanoptera: Thripidae) on select ornamental host plant species in south Florida
Keywords:
chilli thrips, Conocarpus erectus, Schefflera arboricola, RosaAbstract
Chilli thrips, Scirtothrips dorsalis Hood (Thysanoptera: Thripidae), is a troublesome pest of agronomic, vegetable, fruit, and ornamental crops. Scirtothrips dorsalis dispersal and monitoring were evaluated under field and greenhouse conditions in Homestead and Apopka, Florida, in 2007. A field test examined dispersal from Knock-Out® rose, Rosa ‘Radrazz’ (Rosaceae), onto green buttonwood, Conocarpus erectus L. (Combretaceae), and ‘Emerald Green’ schefflera, Schefflera arboricola Forst & Forst ‘Emerald Green’ (Araliaceae). Fewer adults were caught in traps set north, east, or south than west of rose plants corresponding to the average wind direction. Scirtothrips dorsalis flights increased during the morning to early afternoon, peaked about 9:00 a.m. to 2:00 p.m. EST, then decreased to almost no flights by 8:00 p.m. Warmer temperature and lower humidity corresponded to more adults caught per hour with most flights occurring after the accumulation of 300 degree-hours. ‘Emerald Green’ schefflera was preferred over, or may have been less repelling than, green buttonwood. Yellow sticky-card traps were most effective when placed downwind of suspected host plants, and field sites may need more traps per unit area and longer exposure periods than greenhouse sites. These findings may help managers to better monitor and manage S. dorsalis.
Resumen
Trips de pimienta, Scirtothrips dorsalis Hood (Thysanoptera: Thripidae), es una plaga molesta de agronómica, verdura, fruta, y cultivos ornamentales. Se evaluaron la dispersión y el monitoreo de S. dorsalis en el campo y el invernadero en Homestead y Apopka, FL, E.U., en 2007. Una prueba de campo examinó la dispersión desde rosa Knock-Out ®, Rosa ‘Radrazz’ (Rosaceae), al botoncillo verde, Conocarpus erectus L. (Combretaceae), a la schefflera ‘Emerald Green’, Schefflera arboricola Forst y Forst ‘Emerald Green’ (Araliaceae). Menos adultos fueron capturados en trampas puestas al norte, al este, o al sur comparado del oeste de los rosales, que correspondio a la dirección media del viento. Vuelos de S. dorsalis aumentaron durante la mañana hasta temprano en la tarde, y alcanzó su punto máximo a las 9:00 h a 14:00 h EST, luego disminuyó a casi ningun vuelos antes de las 20:00 h. Temperaturas mas altas y humedades más bajas correspondieron a más adultos de S. dorsalis capturados cada hora con la mayoría de los vuelos producidos después de la acumulación de 300 grado-horas. Schefflera ‘Emerald Green’ fue mas preferido que (o posiblemente menos rechazo que) botoncillo verde. Trampas de tarjetas pegajosas y amarillas eran más eficaces cuando se colocan a favor del viento de las plantas hospederas sospechosos. Tambien, sitios en el campo pueden necesitar más trampas por unidad de área y por los períodos de exposición más largos que los sitios de invernadero. Estos hallazgos podrían ayudar a los administradores a controlar y gestionar mejor el S. dorsalis.
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