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Detecting aphid predation by earwigs in organic citrus orchards using molecular markers

Published online by Cambridge University Press:  14 March 2012

C. Romeu-Dalmau ,
J. Piñol  and
N. Agustí
C. Romeu-Dalmau*
Affiliation:
Department of Animal Biology, Plant Biology and Ecology, and Centre for Ecological Research and Forestry Applications (CREAF). Universitat Autònoma de Barcelona, Facultat de Biociències, 08193, Bellaterra, Barcelona, Spain
J. Piñol
Affiliation:
Department of Animal Biology, Plant Biology and Ecology, and Centre for Ecological Research and Forestry Applications (CREAF). Universitat Autònoma de Barcelona, Facultat de Biociències, 08193, Bellaterra, Barcelona, Spain
N. Agustí
Affiliation:
IRTA, Entomology, Carretera de Cabrils, Km 2, E-08348 Cabrils, Barcelona, Spain
*
*Author for correspondence Fax: 0034 93 5814151 E-mail: [email protected]
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Abstract

Aphids (Hemiptera: Aphidoidea) can damage citrus trees via direct damage to leaves and flowers or via the indirect transmission of viruses. Predators such as the European earwig, Forficula auricularia Linnaeus (Dermaptera: Forficulidae), may assist in keeping aphid populations under control in citrus orchards. Group-specific primers were developed to detect aphid DNA in earwigs, in order to determine earwig predation rates in aphids in Mediterranean organic citrus trees. These primers were designed in accordance with the alignment of comparable sequences of aphids and earwigs, and they amplified a 224 bp fragment of the mitochondrial cytochrome c oxidase subunit I (COI) region. Following the consumption of three to five Aphis spiraecola Patch, aphid DNA was still detectable in 50% of earwigs one day after the ingestion. When predation was evaluated in the field, aphid DNA was detected in earwigs in May, June and July but not in April and August. The most interesting result is that of May, when aphid abundance was very low but 30% of the earwigs tested positive for aphid DNA. This finding suggests that earwigs are important aphid predators in citrus orchards, as they probably alter aphid dynamics as a result of early seasonal pressure on this pest.

Keywords

DermapteraForficula auriculariaAphis spiraecolaPCRgut-content analysisCOI
Type
Research Paper
Information
Bulletin of Entomological Research , Volume 102 , Issue 5 , October 2012 , pp. 566 - 572
Copyright
Copyright © Cambridge University Press 2012

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