Effects of Bacillus thuringiensis on adults of Cotesia plutellae (Hymenoptera: Braconidae), a parasitoid of the Diamondback moth, Plutella xylostella (Lepidoptera: Plutellidae)

Charles F. Chilcutt, Bruce E. Tabashnik

Research output: Contribution to journalArticlepeer-review

27 Scopus citations

Abstract

To complement existing information on the mortality of larvae of the wasp Cotesia plutellae attacking moth caterpillars infected with Bacillus thuringiensis (Bt) we tested the direct and indirect effects of the bacterium on adult wasp longevity and oviposition behaviour. In one experiment with female parasitoids, mean longevity (± SEM) was not significantly different between females exposed to Bt (1.98±0.08 days) and those not exposed (2.18±0.13 days). In a second experiment with both males and females, Bt treatment did not significantly effect either male or female parasitoids exposed to Bt. To observe the possible effects of Bt on oviposition behaviour of C. plutellae each of 10 females were given five larvae that had been treated with Bt and five untreated larvae at the same time. All parasitoids were observed to make oviposition attempts in both untreated and treated larvae. Upon dissection of the host larvae, one or more C. plutellae eggs were found in each of the larvae in which a parasitoid attempted oviposition. There was no effect of Bt treatment on parasitoid oviposition. The mean number of ovipositions in treated larvae (4.2±0.3) was not significantly different from untreated larvae (4.7±0.2).

Original languageEnglish (US)
Pages (from-to)435-440
Number of pages6
JournalBiocontrol Science and Technology
Volume9
Issue number3
DOIs
StatePublished - Sep 1999

Keywords

  • Bacillus thuringiensis
  • Cotesia plutellae
  • Diamondback moth

ASJC Scopus subject areas

  • Agronomy and Crop Science
  • Insect Science

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