Live Oaks, New Hosts for Odontocynips Nebulosa Kieffer (Hymenoptera: Cynipidae) in North America

  • Authors: Wilson, A. Dan; Lester, D.G.; Edmonson, R.E.
  • Publication Year: 2000
  • Publication Series: Miscellaneous Publication
  • Source: Proc. Entomol. Soc. Wash. 102(2), 2000, pp. 360-373

Abstract

A study of root-feeding insects as potential vectors of the oak wilt fungus Ceratocystis figaceurum (T. W. Bretz) J. Hunt in live oaks, revealed root galls induced by the cynipid gall wasp Odontocynips nebulosa Kieffer. The incidence of the wasp on roots of four oak species and natural live oak hybrids at 14 root excavation sites in 7 counties throughout the Hill Country of central Texas was surveyed. The study was limited to sites within and adjacent to oak wilt infection centers of the live oak-Ashe juniper ecotype where oak wilt infected live oaks were being uprooted and rogued for disease suppression by the Texas Oak Wilt Suppression Project. This is the first report of this root-galling wasp on live oaks, Q. fusiformis Small and Quercus virginiana Miller X Quercus fusiformis natural hybrids, in North America. The incidence of root-galling by the wasp occurred at relatively low levels among trees examined at excavation sites in each county, indicating a sporadic distribution throughout the region. However, examinations of root-colonization and gall induction by O. nebulosa in uprooted live oaks showed relatively high levels of root infestations in some trees, including trees exhibiting symptoms of oak wilt disease. This pattern suggests high population densities in small localized areas. Examinations of individual gall clusters formed by the wasp on live oak roots revealed new details of gall morphology and developmental stages of the insect within galls. The significance of this wasp as a potential vector of the oak wilt fungus is discussed.

  • Citation: Wilson, A. Dan; Lester, D.G.; Edmonson, R.E. 2000. Live Oaks, New Hosts for Odontocynips Nebulosa Kieffer (Hymenoptera: Cynipidae) in North America. Proc. Entomol. Soc. Wash. 102(2), 2000, pp. 360-373
  • Keywords: host-parasite relationships, Odontocynips nebulosa, Quercus fusiformis, Quercus virginiana, cynipid gall wasps, Ceratocystis fagaceurum, oak wilt fungus
  • Posted Date: April 1, 1980
  • Modified Date: September 25, 2006
  • Requesting Print Publications

    Publication requests are subject to availability. Fiscal responsibility limits the hardcopies of publications we produce and distribute. Electronic versions of publications may be downloaded, distributed and printed.

    Please make any requests at pubrequest@fs.fed.us.

    Publication Notes

    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
    • Our online publications are scanned and captured using Adobe Acrobat. During the capture process some typographical errors may occur. Please contact the SRS webmaster if you notice any errors which make this publication unusable.
    • To view this article, download the latest version of Adobe Acrobat Reader.