Spodoptera litura, Pieris rapae, Beet armyworm, Pieris rapae, Plutella xylostella, Pieris and other larvae will harm cruciferous crops such as Brassica napus and Brassica napus. For the effective control period of the above-mentioned pests, the larvae should be used before the third instar stage (the larvae should be treated as a one-year old for each peeling of the larvae). Insecticides used were 20% fenprofosf emulsion 2000 times, or 2.5 g/L top cyfluthrin EC 2500x or 20% urea suspension 1000x, or 1.8% ivermectin Neutral EC 3000 times. Also, use drugs alternately, otherwise the pests will develop drug resistance.
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