The insect growth regulator insecticide cyromazine causes earlier emergence in Drosophila melanogaster

Abstract

The insecticide cyromazine, classified as an insect growth regulator, inhibits the growth and development of Diptera. The precise mode of cyromazine action remains unknown. We investigated mortality and developmental time effects after exposing first instar Drosophila melanogaster larvae to cyromazine for 8-h intervals. Significant increases in mortality were only observed for cyromazine exposure within the first 16 h of the first instar stage, suggesting that cyromazine accumulates in the larvae over time and that there is a delay between cyromazine exposure and effect. We observed that exposure to cyromazine during the early first instar stage resulted in earlier eclosion of adults when co..