Aphids: chemical agents can be used to control aphids. Plants can be sprayed with 50% chlorpyrifos EC 1000 times, usually once every 6-7 days, and then twice or thrice.
Pieris rapae: 20% pyrethroid EC can be sprayed 2,000 times for control, and can be sprayed 2-3 times.
Soft rot usually occurs in the late growth stage of cabbage. When the diseased plants are found, they should be treated in time, and the plants can be sprayed with shuimycin and streptomycin.