Effects of Rose Cultivars and Fertilization Rates on Populations of Scirtothrips dorsalis (Thysanoptera: Thripidae) in Southern Florida
Keywords:
Chilli thrips, damage rating, Rosa spp., plant partsAbstract
Roses (Rosa spp. L.) are important ornamental hosts of chilli thrips, Scirtothrips dorsalis Hood (Thysanoptera: Thripidae). The knowledge of how these thrips affect 8 cultivars of landscape roses popular in Florida (‘Angel Face’, ‘Don Juan’, ‘Pink Summer Snow’, ‘Radcon’, ‘Radrazz’, ‘Radsunny’, ‘St. Patrick’, and ‘Sun Flare’) would help in developing techniques for integrated pest management of S. dorsalis. The effects of 3 rates of fertilizer and cultivars on population densities of chilli thrips and on host plant damage were evaluated. Fertilization rate, plant organ, and cultivar were important in determining S. dorsalis population density. Differences in total numbers of S. dorsalis, damage rating, and in numbers of flowers and buds produced were observed among different fertilizer rates. The higher rates recommended for accelerated floral growth resulted in more S. dorsalis damage, but not in more flowers than the rates suggested for maintenance. Among parts of the rose plant, buds had the highest density of S. dorsalis, followed by flowers and leaves, which had similar low densities. Larger flowers had more S. dorsalis than small flowers, but population densities were similar. Different cultivars of Knock-Out® rose were similar in their susceptibility to S. dorsalis, but ‘Radcon’, ‘Don Juan’, and ‘Sun Flare’ had more damage with lower S. dorsalis abundance and density than other the cultivars.
Las rosas ornamentales (Rosa spp. L.) son huéspedes importantes para los trips de pimienta, Scirtothrips dorsalis Hood (Thysanoptera: Thripidae), por lo tanto, un conocimiento de sus efectos a los ocho cultivares de rosas populares en la Florida (‘Angel Face’, ‘Don Juan’, ‘Pink Summer Snow’, ‘Radcon’, ‘Radrazz’, ‘Radsunny’, ‘St. Patrick’, y ‘Sun Flare’) podria asistir en el desarrollo de técnicas para una programa de manejo integrado de los trips de pimienta. Los efectos de tres tasas de abono y cultivar en la densidad de población de trips pimienta y daño al planta huéspeda fueron evaluados. Tasa de fertilización, órgano de planta, y cultivar fueron importantes para determinar el densidad población de los trips de pimienta. Diferencias en el número total de trips pimienta, el daño, y el número de flores y brotes fueron observados en los tasas de fertilizante. Las tasas mas altas recomendadas por el crecimiento accelerado de flores resultaron en mas daño por los trips de pimienta y no en mas flores que niveles de fertilizantes recomendados para el mantenimiento de las plantas. Entre los organos de la planta rosa, los brotes tuvieron la densidad mas alta de los trips pimienta, seguido para las flores y las hojas, que tuverion densidades parecidos y bajas. Las flores más grandes obtuvieron mas trips de pimienta que flores pequeños, pero sus densidades poblaciónes fueron parecidos. Las cultivares diferentes de rosa Knock-Out® fueron parecidos en sus susceptibilidades de los trips pimienta, pero ‘Radcon’, ‘Don Juan’, y ‘Sun Flare’ obtuvieron mas daño con menos abundancia y densidad de trips pimienta de las otras cultivares .
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