Survey of gall wasps of the family Cynipidae associated with two oak species, Quercus brantii and Q. infectoria in Lorestan province of Iran

Document Type : Research Paper

Authors

Abstract

This study was carried out in the period 2003-2005 to collect and identify gall wasps on oak species in Lorestan province. There are mainly two oak species, Quercus infectoria and Q. brantii with various dispersion patterns in the province. Thus, three sampling sites were selected to cover whole distributional pattern of oak forests. These include: Ghalaii, Nogian and Shoorab. Sampling dates were determined based on climatic conditions and development stages of gall formation, (as the gall reaches maturation). Collected galls were placed in plastic bags, labeled and transferred to the lab. In the lab, any particular galls were screened distinctly and accompanied galls were removed. Upon screening, galls were counted and placed in rearing jars. These were maintained in the laboratory at 19±3°C in mid autumn and winter and 25±2°C in early spring and summer and in 50-60% RH. Samples were examined at four days intervals and emerged insects were screened based on family, genus, and species and placed into vials containing 75% alcohol and labeled accordingly. Information including the emerging dates and all relevant data were recorded. Based on the results obtained, 26 different galls were collected on various plant parts (catkins, buds, fruits, leaves) of two oak species. Overall, 11 gall wasps are active on Q. brantii and 13 gall wasps on Q. infectoria. All galls collected on Q. infectoria are formed by the agamic generation of gall wasps. While on Q. brantii, most galls (7 galls) are formed by the sexual generation and 5 galls by the agamic wasp generation. There is high host specificity between the gall wasps, thus we can not find any common gall on two oak species. Dispersion of Cynipid gall wasps is directly dependent on the distribution patterns of oak species in Lorestan province.
 
 

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References

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History

  • Receive Date: 23 September 2006
  • Revise Date: 07 June 2016
  • Accept Date: 06 August 2007

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