Allelochemical induced stress: Effects of l-canavanine on the pathogenicity of Bacillus thuringiensis in Manduca sexta

Gary Felton, D. L. Dahlman

Research output: Contribution to journalArticle

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Increased susceptibility of Manduca sexta to commercial formulations of the microbial insecticide, Bacillus thuringiensis, as evidenced by lower LD50 and LT50 values, was observed when M. sexta were reared on an artificial diet supplemented with a sublethal concentration (2.5 mm) of l-canavanine. At several dosages of B. thuringiensis, which were administered either by diet contamination or by per os forced feeding, a greater than 70% reduction (P < 0.05) occurred in the LT50 response with canavanine-treated larvae. The LD50 values also were lowered by canavanine treatment. This constitutes the first report of a plant allelochemical enhancing the effect of B. thuringiensis in vivo. It is suggested that canavanine enhances the effect of B. thuringiensis on gut permeability and active transport.

Original languageEnglish (US)
Pages (from-to)187-191
Number of pages5
JournalJournal of invertebrate pathology
Issue number2
Publication statusPublished - Jan 1 1984


All Science Journal Classification (ASJC) codes

  • Ecology, Evolution, Behavior and Systematics
  • Insect Science

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