<p>Aphids are considered as important pests of citrus orchards in the Mediterranean region, directly and indirectly threatening production. The use of biological control agents to suppress aphid populations in integrated pest management (IPM) strategies has increased, but parasitoid success is often limited by hyperparasitoid presence. This study documents several Charipinae (Hymenoptera: Cynipoidea: Figitidae) species, expanding the known biodiversity of hyperparasitoids in Algerian citrus orchards. <i>Alloxysta pusilla</i> (Kieffer 1902) is here recorded for the first time in Algeria and represents a novel association with <i>Aphis spiraecola</i> (Patch 1914), the dominant aphid species in the region. <i>Alloxysta victrix</i> (Westwood 1834), <i>Alloxysta pilipennis</i> (Hartig 1840) and <i>Phaenoglyphis villosa</i> (Hartig 1841) were observed for the first time on <i>Aphis</i> (<i>Toxoptera</i>) <i>aurantii</i> (Boyer de Fonscolombe 1841). These findings emphasize the complexity of aphid–parasitoid interactions and that Charipinae hyperparasitoids may have a greater role in reducing biological control efficacy than has been previously understood. The results serve as a basis for future work to fine tune IPM strategies utilized in Mediterranean citrus ecosystems.</p>

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First records and new host associations of Charipinae (Hymenoptera: Figitidae) hyperparasitoids on aphids in Algerian citrus orchards

  • Zine Eddine Labdaoui,
  • Yamina Guenaoui,
  • Juli Pujade-Villar,
  • Jesus Selfa,
  • Mar Ferrer-Suay

摘要

Aphids are considered as important pests of citrus orchards in the Mediterranean region, directly and indirectly threatening production. The use of biological control agents to suppress aphid populations in integrated pest management (IPM) strategies has increased, but parasitoid success is often limited by hyperparasitoid presence. This study documents several Charipinae (Hymenoptera: Cynipoidea: Figitidae) species, expanding the known biodiversity of hyperparasitoids in Algerian citrus orchards. Alloxysta pusilla (Kieffer 1902) is here recorded for the first time in Algeria and represents a novel association with Aphis spiraecola (Patch 1914), the dominant aphid species in the region. Alloxysta victrix (Westwood 1834), Alloxysta pilipennis (Hartig 1840) and Phaenoglyphis villosa (Hartig 1841) were observed for the first time on Aphis (Toxoptera) aurantii (Boyer de Fonscolombe 1841). These findings emphasize the complexity of aphid–parasitoid interactions and that Charipinae hyperparasitoids may have a greater role in reducing biological control efficacy than has been previously understood. The results serve as a basis for future work to fine tune IPM strategies utilized in Mediterranean citrus ecosystems.