Phytoparasitica

, Volume 41, Issue 2, pp 125–131 | Cite as

Interactions between the introduced fungal pathogen Entomophaga maimaiga and indigenous tachinid parasitoids of gypsy moth Lymantria dispar in Bulgaria

  • Georgi Georgiev
  • Zdravko Hubenov
  • Margarita Georgieva
  • Plamen Mirchev
  • Maria Matova
  • Leellen F. Solter
  • Daniela Pilarska
  • Plamen Pilarski
Article

Abstract

Interactions between the gypsy moth, Lymantria dispar L. (Lepidoptera: Erebidae), pathogenic fungus Entomophaga maimaiga, and the tachinid parasitoid (Diptera: Tachinidae) complex in gypsy moth larvae were investigated in Bulgaria, where E. maimaiga was recently released as a biological control agent. Gypsy moth larvae were collected in oak stands where E. maimaiga was originally introduced (nine sites) and in sites where the pathogen has invaded by natural extension of the range (ten sites). In total, 4,375 host larvae were examined and 401 tachinid larvae emerged from parasitized hosts. Host mortality caused by tachinids varied from 0 to 48.5% among sites, with an overall average of 9.2%. Emerging adult tachinid parasitoids included 54 individuals belonging to six species: Compsilura concinnata, Exorista larvarum, Senometopia separata, Senometopia excisa, Drino incospiqua and Zenilia libatrix; the remaining parasitoids (86.5%) died in the pupal stage. E. maimaiga azygospores were observed on puparia surfaces, an indication that the gypsy moth host larvae were infected with the fungus. No azygospores were observed in parasitoid tissues. The high parasitoid mortality may be the result of the competition with E. maimaiga during development in the same host.

Keywords

Mortality Parasitism Tachinidae 

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Copyright information

© Springer Science + Business Media B.V. 2012

Authors and Affiliations

  • Georgi Georgiev
    • 1
  • Zdravko Hubenov
    • 2
  • Margarita Georgieva
    • 1
  • Plamen Mirchev
    • 1
  • Maria Matova
    • 1
  • Leellen F. Solter
    • 3
  • Daniela Pilarska
    • 4
    • 5
  • Plamen Pilarski
    • 6
  1. 1.Forest Research InstituteBulgarian Academy of SciencesSofiaBulgaria
  2. 2.National Museum of Natural HistoryBulgarian Academy of SciencesSofiaBulgaria
  3. 3.Illinois Natural History SurveyPrairie Research Institute at the University of IllinoisChampaignUSA
  4. 4.Institute of Biodiversity and Ecosystem ResearchBulgarian Academy of SciencesSofiaBulgaria
  5. 5.Faculty of Forestry and Wood SciencesCzech University of Life SciencesSuchdolCzech Republic
  6. 6.Institute of Plant Physiology and GeneticsBulgarian Academy of SciencesSofiaBulgaria

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