Aboveground herbivory affects indirect defences of brassicaceous plants against the root feeder Delia radicum Linnaeus: laboratory and field evidence

P.S. Pierre, S. Dugravot, A. Ferry, R. Soler, N.M. van Dam, A.M. Cortesero

Research output: Contribution to journalArticleAcademicpeer-review

17 Citations (Scopus)

Abstract

1. Belowground herbivory has recently been shown to disrupt the host location behaviour of aboveground parasitoids and thereby impact plants indirect defences. Reverse interactions, on the other hand, have received little attention so far. 2. Lab and field studies were conducted to examine whether the presence of the leaf herbivore Pieris brassicae Linnaeus on brassicaceous plants influences the response of Trybliographa rapae Westwood, a specialist parasitoid of the root feeder Delia radicum Linnaeus. 3. The present results show that the attraction of the parasitoid towards host-infested plants disappeared when these plants were also infested by P. brassicae. This absence of attraction was observed both when the complete odour blend or only undamaged leaves from damaged plants were offered, emphasising the role of systemically induced volatiles for host location in T. rapae. 4. Furthermore, the field study revealed that parasitism levels dropped from 30% on root-infested plants to 4% on double-infested plants. 5. The present study is the first to confirm that reduced attraction to host-infested plants as a result of simultaneous attack by below- and aboveground herbivores translates into lower levels of parasitism in the field.
Original languageEnglish
Pages (from-to)326-334
JournalEcological Entomology
Volume36
Issue number3
DOIs
Publication statusPublished - 2011

Keywords

  • natural enemies
  • entomopathogenic nematodes
  • specialist herbivore
  • insect herbivores
  • induced volatiles
  • infochemical use
  • cabbage plants
  • host-plant
  • performance
  • attraction

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