Mortality of colorado potato beetle (Leptinotarsa decemlineata) after sublethal stress with the CryIIIA δ-endotoxin of Bacillus thuringiensis and subsequent exposure to Beauveria bassiana

Scott D. Costa, Mary E. Barbercheck, George G. Kennedy

Research output: Contribution to journalArticle

16 Scopus citations

Abstract

Acute or chronic sublethal exposure of Colorado potato beetle larvae to the CryIIIA δ-endotoxin of Bacillus thuringiensis Berliner did not significantly (P > 0.05) alter their subsequent susceptibility to Beauveria bassiana (Balsamo) Vuillemin. During the period of exposure to B. bassiana there was continued mortality from previous exposure to δ-endotoxin, and B. bassiana also caused significant mortality. Acute and chronic exposure to δ-endotoxin significantly prolonged larval development. The weights of prepupae and adults were significantly reduced by exposure to δ-endotoxin, with the greatest effect being from chronic exposure. Separation of the manifestations of stress in time (feeding vs soil stages) and space (toxin damage to the insect gut vs fungal penetration of the cuticle and activity in the hemocoel) may have precluded alteration of insect susceptibility to infection by B. bassiana. Endemic populations of B. bassiana are not expected to influence the development of resistance in the Colorado potato beetle to the δ-endotoxin of B. thuringiensis.

Original languageEnglish (US)
Pages (from-to)173-179
Number of pages7
JournalJournal of invertebrate pathology
Volume77
Issue number3
DOIs
StatePublished - Jan 1 2001

All Science Journal Classification (ASJC) codes

  • Ecology, Evolution, Behavior and Systematics

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