Synergism of Bacillus thuringiensis by Ethylenediamine Tetraacetate in Susceptible and Resistant Larvae of Diamondback Moth (Lepidoptera: Plutellidae)

Yong Biao Liu, Bruce E. Tabashnik

Research output: Contribution to journalArticle

10 Scopus citations

Abstract

We measured mortality of neonates and 3rd instars from susceptible and resistant colonies of diamondback moth, Plutella xylostella (L.), caused by Bacillus thuringiensis with and without ethylenediamine tetraacetate (EDTA) and trypsin. For susceptible larvae, the addition of EDTA + trypsin reduced the LC50 of B. thuringiensis by 5-fold in neonates but had no effect on 3rd instars. For resistant larvae, the addition of EDTA + trypsin significantly reduced LC50s of B. thuringiensis by 2- to 3-fold in neonates and 3rd instars. EDTA + trypsin without B. thuringiensis did not kill larvae. Further tests with susceptible and resistant neonates showed that EDTA significantly increased the toxicity of B. thuringiensis, whereas trypsin had no effect and no interaction occurred between EDTA and trypsin.

Original languageEnglish (US)
Pages (from-to)287-292
Number of pages6
JournalJournal of economic entomology
Volume90
Issue number2
DOIs
StatePublished - Apr 1997

Keywords

  • Age
  • Bacillus thuringiensis
  • Ethylenediamine tetraacetate
  • Plutella xylostella
  • Resistance
  • Trypsin

ASJC Scopus subject areas

  • Ecology
  • Insect Science

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