Gall structure affects ecological associations of Dryocosmus kuriphilus (Hymenoptera: Cynipidae)

W. Rodney Cooper, Lynne K. Rieske

Research output: Contribution to journalArticlepeer-review

44 Scopus citations

Abstract

Gall wasps (Hymenoptera: Cynipidae) induce structures (galls) on their host plants that house developing wasps and provide them with protection from natural enemies. The Asian chestnut gall wasp, Dryocosmus kuriphilus Yasumatsu, is an invasive pest that is destructive to chestnut (Castanea spp.). An improved understanding of the interactions among D. kuriphilus, its host, and its natural enemies is critical for the development of effective management strategies against this pest. The objective of our study was to evaluate the D. kuriphilus community interactions, and relate these interactions to variations among gall traits. Galls were collected from four locations throughout the eastern United States from May (gall initiation) through August (after gall wasp emergence), and January. Gall characteristics (volume, weight, and schlerenchyma layer thickness), gall inhabitants (D. kuriphilus, parasitoids, and chamber fungi), and other community associates (insect herbivores and lesions thought to be caused by endophytes) were evaluated and correlated using canonical correlation analyses. The primary mortality factors for D. kuriphilus were parasitism, gall chamber-invading fungi, and failure of adult gall wasps to emerge. Larger gall size and thicker schlerenchyma layers surrounding the larval chambers were negatively correlated with parasitoids and chamber fungi, indicating these gall traits are important defenses. External fungal lesions and insect herbivory were positively correlated with the absence of D. kuriphilus within galls. This study provides support for the protective role of cynipid galls for the gall inducer, identifies specific gall traits that influence gall wasp mortality, and improves our knowledge of D. kuriphilus ecology in North America.

Original languageEnglish
Pages (from-to)787-797
Number of pages11
JournalEnvironmental Entomology
Volume39
Issue number3
DOIs
StatePublished - Jun 2010

Keywords

  • American chestnut
  • Chestnut weevil
  • Chinese chestnut
  • Ormyrus labotus
  • Torymus sinensis

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Ecology
  • Insect Science

Fingerprint

Dive into the research topics of 'Gall structure affects ecological associations of Dryocosmus kuriphilus (Hymenoptera: Cynipidae)'. Together they form a unique fingerprint.

Cite this