Deltamethrin is the most toxic to insects among pyrethroid insecticides, It has contact and stomach poisoning effects, rapid contact killing, strong knockdown, no fumigation and systemic effects, and it has no fumigation and systemic effects at high concentrations. Harmful substances have a repellent effect. Long duration (7-12 days). Formulated into emulsifiable concentrate or wettable powder, it is a medium insecticide. It has a wide insecticidal spectrum and is effective against many kinds of pests such as Lepidoptera, Orthoptera, Thysanoptera, Hemiptera, Diptera, Coleoptera, etc., but has low control effect on tuberculosis, scale insects, and bugs. Or it is basically ineffective, which may induce parasitic reproduction. When pests are concurrent, it should be mixed with special acaricides.