Sensitivity ofDaphnia carinataSensu Lato to the Insect Growth Regulator, Pyriproxyfen

This paper reports the sensitivity ofDaphnia carinatasensu lato to pyriproxyfen, a promising chironomid control agent. Neonates exposed to pyriproxyfen in acute toxicity trials produced 48-hr LC50of 0.08 ppm, eight times the concentration known to control the emergence of nuisance chironomids. However, continuous exposure to pyriproxyfen (0.01 ppm) during a 3-brood, 14-day life cycle test, suppressed the growth ofD. carinataand reduced reproduction by as much as 80%.