Joint Toxicity of Xanthene Dyes to the House Fly (Diptera: Muscidae)

Abstract
Eight xanthene dyes were tested to determine whether they would synergize the toxicity of erythrosin B to adult Musca domestica L. In 1:1 combinations, six dyes exhibited synergistic activity. These were rose bengal, eosin Y, diiodofluorescein, fluorescein, octabromofluorescein, and phloxin B. Dibromofluorescein was inactive, and dichlorofluorescein had an antagonistic effect. Increased efficiency of erythrosin B in killing insects by using lesser amounts in combination with certain other dyes was demonstrated.