Effect of humidity on fecundity and egg incubation of Frankliniella bispinosa and Frankliniella occidentalis (Thysanoptera: Thripidae)
Keywords:
thrips, fecundity, relative humidity, egg incubationAbstract
Environmental factors are hypothesized to account for spatial and temporal differences in Florida in the abundance and distribution of the native thrips species Frankliniella bispinosa (Morgan) and the invasive Frankliniella occidentalis (Pergande) (Thysanoptera: Thripidae). Laboratory experiments were conducted at a constant temperature of 23 ± 1 °C to investigate the effects of humidity on the fecundity and egg incubation of F. bispinosa and F. occidentalis. Adult thrips were allowed to oviposit on green bean (Phaseolus vulgaris L.; Fabaceae) pods. Eggs were maintained at relative humidity treatment levels of 40 ± 5, 55 ± 5, 70 ± 5, and 80 ± 5%. Fecundity and time of egg hatch were determined every 12 h. Results showed that F. bispinosa had a higher fecundity and a shorter time to egg hatch compared with F. occidentalis at higher humidity levels. These results partially explained patterns of abundance and distribution of F. bispinosa and F. occidentalis in Florida. When relative humidity was high in summer and fall, populations of F. bispinosa were abundant and population levels of F. occidentalis were very low. Management strategies for F. bispinosa and F. occidentalis can be improved to accommodate the biological differences.
Resumen
Se postula que los factores ambientales dan cuenta para las diferencias espaciales y temporales de la abundancia y distribución de las especies de trips nativos Frankliniella bispinosa (Morgan) y el trips invasor Frankliniella occidentalis (Pergande) (Thysanoptera: Thripidae) en la Florida. Se realizaron los experimentos de laboratorio a una temperatura constante de 23 ± 1 °C para investigar los efectos de la humedad sobre la fecundidad e incubación de huevos de F. bispinosa y F. occidentalis. Los adultos de trips se les permitió poner huevos sobre las vainas de las habichuelas (Phaseolus vulgaris L .; Fabaceae). Se mantuvieron los huevos a niveles de tratamiento de humedad relativa de 40 ± 5, 55 ± 5, 70 ± 5 y 80 ± 5%. Se determinó la fecundidad y el tiempo de eclosión de los huevos cada 12 y 24 horas, respectivamente. Los resultados mostraron que F. bispinosa tenía una fecundidad más alta y un menor tiempo de eclosión de los huevos en comparación con F. occidentalis en los niveles de humedad más altos. Estos resultados explican parcialmente el patrón de abundancia y distribución de F. bispinosa y F. occidentalis en la Florida. Cuando la humedad relativa es alta en verano y otoño, las poblaciones de F. bispinosa fueron abundantes y el nivel de población de F. occidentalis fue muy bajo. Se puede mejorar las estrategias de manejo para F. bispinosa y F. occidentalis para adaptar las diferencias biológicas.
Downloads
Additional Files
Published
Issue
Section
License
Copyright for any article published in Florida Entomologist is held by the author(s) of the article. Florida Entomologist is an open access journal. Florida Entomologist follows terms of the Creative Commons, Attribution Non-Commercial License (cc by-nc). By submitting and publishing articles in Florida Entomologist, authors grant the FOJ and Florida Entomologist's host institutions permission to make the article available through Internet posting and electronic dissemination, and to otherwise archive the information contained both electronically and in a hard printed version. When used, information and images obtained from articles must be referenced and cited appropriately. Articles may be reproduced for personal, educational, or archival purposes, or any non-commercial use. Permission should be sought from the author(s) for multiple, non-commercial reproduction. Written permission from the author(s) is required for any commercial reproduction.
