Arrestment responses of Eretmocerus species and Encarsia deserti (Hymenoptera: Aphelinidae) to Bemisia tabaci honeydew

Orit Shimron, Abraham Hefetz*, Dan Gerling

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The responses of Eretmocerus sp. and Encarsia deserti (Gerling & Rivnay), parasitoids of Bemisia tabaci (Gennadius) to host secretions were investigated. Upon contact with honeydew excreted from the host, the parasitoids' walking speed decreased, whereas the rate of angular turning increased (the walking speed of Eretmocerus sp. and Encarsia deserti decreased from 2.0 to 0.8 and from 0.8 to 0.3 mm/s, respectively, and the respective angular turning rates increased from 123.3 to 489.6 and from 267.9 to 979.2 deg/cm). Moreover, the wasps generally turned back toward the secretion as soon as they lost contact with it. This induced arrestment responses resulted in increased searching time by the parasitoids. Laboratory bioassays were conducted in which paper disks in petri dishes containing different amounts of honeydew, equivalent to the secretions of 1, 5, or 50 larvae, were offered to female wasps. The wasps responded by arrestment even to honeydew produced by a single larva. While the response of Eretmocerus sp. was quantity dependent, being more intense at higher amounts of honeydew, that of E. deserti was of equal intensity at all honeydew quantities assayed.

Original languageEnglish
Pages (from-to)517-526
Number of pages10
JournalJournal of Insect Behavior
Volume5
Issue number4
DOIs
StatePublished - Jul 1992

Keywords

  • Bemisia tabaci
  • Encarsia deserti
  • Eretmocerus sp
  • arrestment
  • contact chemicals
  • honeydew
  • host location
  • kairomone

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