Behavioural response of the entomopathogenic nematodes Steinernema carpocapsae and Heterorhabditis bacteriophora to oxamyl

RANDY GAUGLER, JAMES F. CAMPBELL

Research output: Contribution to journalArticlepeer-review

26 Scopus citations

Abstract

Infective juveniles of the entomopathogenic nematode Steinernema carpocapsae show a low level of locomotory activity that is presumed to limit their usefulness as biological insecticides. A 30 μg ml‐1 solution of the carbamate pesticide oxamyl reduced the proportion of nonmobile nematodes by nearly two thirds to 35%, while stimulating a 7.5‐fold increase in sinusoidal movement. This increase in activity did not result in a corresponding increase in host‐finding. Oxamyl treatment did not enhance infective juvenile pathogenicity to Galleria mellonella larvae. At higher concentrations, oxamyl caused aberrant nematode movement and partial paralysis. Heterorhabditis bacteriophora infective juveniles maintain a high level of locomotory activity. Treatment with 30 μg ml‐1 oxamyl increased the proportion of sinusoidal over nonsinusoidal movements, but infective juvenile host‐finding and pathogenicity were significantly reduced. Higher rates impaired movement and induced complete paralysis. We conclude that oxamyl is incompatible with S. carpocapsae and H. bacteriophora. The concept of chemically activating infective juveniles to increased locomotory activity and thereby achieving enhanced efficacy is inconsistent with our results.

Original languageEnglish (US)
Pages (from-to)131-138
Number of pages8
JournalAnnals of Applied Biology
Volume119
Issue number1
DOIs
StatePublished - Aug 1991

ASJC Scopus subject areas

  • Agronomy and Crop Science

Keywords

  • Heterorhabditis bacteriophora
  • Steinernema carpocapsae
  • host‐finding
  • movement
  • pathogenicity

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