Parasitoids associated with oak gall wasps in Lorestan province

Document Type : Research Paper

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Abstract

This study was carried out to collect and identify gall wasps parasitoids on two oak species in Lorestan province during 2003-2005. Three sampling sites were selected to somehow cover distributional range of oak forests. These include: Ghalaii in northwest of the province, Nogian in southeast and Shoorab in southwest of Khoram-Abad city. Sampling dates were determined based on climatic conditions and development stages of gall formation (gall maturation). Collected galls were placed in plastic bags, labeled and transferred to the laboratory and maintained in the laboratory conditions. Samples were examined at four days intervals and emerged insects were screened based on family, genus, and species and placed in vials containing 75% alcohol and labeled accordingly. In this investigation, 19 parasitoid wasps of 12 genera and 6 families belong to Chalcidoidea superfamily were collected on 22 different galls. These galls are formed by Cynipid wasps on two oak species of Q. infectoria (10 galls) and Q. brantii (12 galls). Overall, Eulophidae family with 4 genera and 6 species was the most prevalent of the all collected Chalcidoidea. Torymidae with two genera and 5 species and Eurytomidae with 3 species are in the next levels of abundance. The genera include Eurytoma (one species) and Sycophila (2 species). Other families include Ormyridae (one genera) and Pteromalidae (2 genera) each with 2 species. Eupelmidae with one species is the least family in terms of abundance and species number.Of 19 collected parasitoid wasp species, 16 occurred on Q. brantii galls, with 9 species found on Q. infectoria. Of these, 3 species are specifically occurring on Q. infectoria galls. Ten species only occur on Q. brantii and 6 species are common on both oak species galls. Based on the results, occurrence of sexual and agamic generations account as the most important factor in enhancing abundance and diversity of parasitoid species on Q. brantii compare to Q. infectoria.
 
 

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References

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Iranian Journal of Forest and Range Protection Research
Volume 5, Issue 2 - Serial Number 10
December 2008
Pages 175-186

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History

  • Receive Date: 05 August 2007
  • Revise Date: 06 June 2016
  • Accept Date: 25 December 2007

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