Enjoy your yard again with Pro-X System's mosquito control program. The liquid application is unlike most insecticides that affect an insect's nervous system. The product Pro-X Systems uses provides a non-neurotoxic mode of action that interferes with the development process of eggs, larvae, and nymphs of many common insect pests. It provides residual control by preventing insets from developing into egg-laying adults. The spray lasts for 60 days and, weather permitting, applications are done in April-May, June-July, and August-September.