What is Methoprene? Methoprene is an amber-colored liquid with a slight fruity odor. Methoprene As an IGR (Insect Growth Regulator) Insecticide Methoprene is an active ingredient in pesticides known as IGRs (Insect Growth Regulators). Methoprene is used most widely in mosquito control, but is also effective as a growth inhi ... |