How to do turnip and cabbage to produce maggots?

What about turnip cabbage maggots? Please point out that the following methods can be used to control radish cabbage maggots: 1. When planting, mix 2 to 3 grains of salt with seeds every time. 2. Soak the white rapeseed and radish seeds in warm water, and then mix them with the bottom ash to make a layer of bottom ash stick to the rapeseed. 3. When planting, sprinkle a kang oil soil on each seed. 4. Mix trichlorfon and omethoate, prepare 800 to 1000 times solution, irrigate roots with spray pot, and irrigate 0.15 to 0.2 kg per root. Click for more radish growing techniques Click for more vegetable growing techniques