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EFFECT OF TEMPERATURE, DIET, AND LARVAL INSTAR ON THE SUSCEPTIBILITY OF AN APHID PREDATOR, #HIPPODAMIA CONVERGENS" (COLEOPTERA:COCCINELLIDAE), TO THE WEAK BACTERIAL PATHOGEN #PSEUDOMONAS FLUORESCENS#
Citation:
James, R. AND B. Lighthart. EFFECT OF TEMPERATURE, DIET, AND LARVAL INSTAR ON THE SUSCEPTIBILITY OF AN APHID PREDATOR, #HIPPODAMIA CONVERGENS" (COLEOPTERA:COCCINELLIDAE), TO THE WEAK BACTERIAL PATHOGEN #PSEUDOMONAS FLUORESCENS#. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-94/559, 1992.
Description:
The authors tested the effects of larval age and stress on the susceptibility of the convergent lady beetle (Hippodamia convergens) to the weakly pathogenic bacterium Pseudomonas fluorescens. o test effects of larval age, the dose response to the bacterium was determined f or each instar. o test for effects of stress, first instar larvae were maintained at two temperatures (25 degrees C or 30 degrees C) and were given one of three diets (water, sucrose solution, or aphids) before being exposed to the pathogen. esults suggest that some stressors, such as poor diet, may decrease the susceptibility of H. convergens to P. fluorescens, whereas certain combinations of stresses, such as starvation and high temperature, have an interactive effect that then increases susceptibility.