Thermal requirements of Fidiobia dominica (Hymenoptera: Platygastridae) and Haeckeliania sperata (Hymenoptera: Trichogrammatidae), two exotic egg parasitoids of Diaprepes abbreviatus (Coleoptera: Curculionidae) |
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Authors: | Josep A Jacas Jorge E Peña Rita E Duncan Bryan J Ulmer |
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Institution: | (1) Departament de Ciències Agràries i del Medi Natural, Universitat Jaume I, Campus del Riu Sec, 12071 Castello de la Plana, Spain;(2) Department of Entomology and Nematology, Tropical Research and Education Center, University of Florida, 18905 SW 280th Street, Homestead, FL 33031, USA |
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Abstract: | Diaprepes abbreviatus is an exotic root weevil occurring in southern US. It is a highly polyphagous species which can complete its entire life
cycle on citrus and several woody ornamental plants. The lack of native egg parasitoids for this weevil in citrus orchards
has triggered efforts to evaluate candidate egg parasitoids from the Caribbean Region into Florida. The egg parasitoids Fidiobia dominica and Haeckeliania sperata are two exotic natural enemies of D. abbreviatus recently introduced in the US in a classical biological control program. The thermal requirements of both parasitoids were
studied in the laboratory. The upper development threshold (UDT) of F. dominica was 30.0°C, its maximal development rate (MDR) occurred at 27.6°C, its lower development threshold (LDT) was 9.6°C and its
thermal constant (K) for development from egg to adult was 293.1 DD. For H. sperata, UDT was 35.0°C, MDR occurred at 31.0°C, LDT was around 15°C and K was 188.1 DD. Based on these results, both species would
be able to complete 17 to 18 generations annually in southern Florida. However, host availability during critical periods
could severely impair the ability of these egg parasitoids to establish and successfully control D. abbreviatus in areas where winter temperatures fluctuate around 12°C, the LDT for this pest. |
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Keywords: | Biological control Citrus IPM Development Thermal constant Temperature thresholds |
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