The diamondback moth (Plutella xylostella) is an important insect pest of Brassica crops the population dynamics of which is affected by geography, climate change and planting patterns. Now resistant to a wide range of insecticides, this moth has the highest levels of insecticide resistance among insect pests. Based on the above biological characteristics, a set of techniques for surveying populations and monitoring pesticide resistance have been developed for diamondback moth.