Photodynamic Action in Insects. 1. Levels of Mortality in Dye-Fed Light-Exposed House Flies 123

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Abstract
The effectiveness of 6 fluorescent dyes was determined in the photodynamic killing of Musca domestica L. under conditions of darkness, and artificial and natural light. Rose bengal, erythrosin B , and rhodamine caused the highest mortality in dye-fed, light-exposed flies; eosin yellow was not as effective but was more effective than methylene blue chloride. Flies fed a dye concentration of 0.25%, and exposed to artificial light for 3 h had the following mean mortality: rose bengal, 100%; erythrosin B , 96%; rhodamine, eosin yellow, 49% and methyleneblue chloride, 8%. With light intensity considered as a factor contributing to mortality, all dyes were comparable under both artificial and natural light. Very low levels of mortality were observed for dye-fed flies kept in darkness, and there was no mortality in the controls.

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