Florida Entomologist (2001) 84, 227-233

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Clint D. McFarland and Marjorie A. Hoy (2001)
Survival of Diaphorina citri (Homoptera: Psyllidae), and its two parasitoids, Tamarixia radiata (Hymenoptera: Eulophidae) and Diaphorencyrtus aligarhensis (Hymenoptera: Encyrtidae), under different relative humidities and temperature regimes
Florida Entomologist 84 (2), 227-233
Abstract: The ability of an exotic citrus pest, Diaphorina citri Kuwayama, and its two parasitoids, Tamarixia radiata (Waterston) and Diaphorencyrtus aligarhensis (Shafee, Alam and Agarwal), to survive under different relative humidities (7%, 33%, 53%, 75% and 97%) at 25 and 30°C was compared. The data obtained may help to predict potential climatic limitations to their establishment in Florida and indicate whether the pest has different climatic tolerances compared to these parasitoid populations. Adult survival was evaluated under relative humidities maintained by saturated salt solutions. D. citri survived longer than the parasitoid populations at all experimental conditions, suggesting it has a lower net water loss rate. The T. radiata (Taiwan) population showed the greatest moisture requirement at all temperatures and relative humidities tested. The T. radiata (Vietnam) population survived longer than the Taiwan, suggesting that the two populations may perform differently in different geographical regions. D. aligarhensis and T. radiata (Vietnam) survived similar lengths of time, except at the higher relative humidities, so the moisture requirements for these two populations are comparable.

La habilidad de la plaga exótica del cítrico, Diaphorina citri Kuwayama, y sus dos parasitoides, Tamarixia radiata (Waterson) y Diaphorencyrtus aligarhensis (Shafee, Alam and Agarwal) de sobrevivir bajo diferentes humedades relativas (7%, 33%, 53%, 75% y 97%) a 25 y 30°C fueron comparadas. Los datos obtenidos pueden ayudar a predecir las limitaciones potenciales climáticas a su establecimiento en la Florida e indican si la plaga tiene diferentes tolerancias climáticas en comparación a estas poblaciones parasitoides. La supervivencia de adultos fue evaluada bajo humedades relativas mantenidas por soluciones de sal saturada. D. citri sobrevivió mas tiempo que las poblaciones parasitoides bajo todas las condiciones experimentales, sugiriendo que tiene una velocidad mas baja de perdida de agua neta. La población T. radiata (Taiwán) demostró el mayor requerimiento de humedad en todas las temperaturas y humedades relativas probadas. La población T. radiata (Vietnam) sobrevivió mas que la de Taiwán, sugiriendo que las dos poblaciones pueden ejecutar de manera distinta en diferentes regiones geográficas. D. aligarhensis y T. radiata (Vietnam) sobrevivieron duraciones de tiempo similares, excepto bajo humedades relativas altas, indicando que los requerimientos de humedad para estas dos poblaciones son comparables.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Full text of article
Database assignments for author(s): Marjorie A. Hoy

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
environment/habitat manipulation


Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.


Diaphorina citri U.S.A. (SE)
Tamarixia radiata (parasitoid) Taiwan
Tamarixia radiata (parasitoid) Vietnam
Tamarixia radiata (parasitoid) Diaphorina citri U.S.A. (SE)
Diaphorencyrtus aligarhensis (parasitoid) Diaphorina citri U.S.A. (SE)