1. Use of chemical agents: spray beta-cypermethrin, emamectin benzoate, chlorantraniliprole suspension and imidacloprid mixed agent 1 times every 2-3 days after Chinese cabbage emergence, and spray 1 times every 5 days to ensure that the agent has no residue and low toxicity, so as to avoid damage to Chinese cabbage seedlings. 2. Use poison bait: after emergence, spread poison bait made of phoxim and chopped fresh vegetables around the vegetable field. Be careful not to spill it on the cabbage seedlings. 3. Weed cleaning: clear the surrounding weeds in time, destroy the living place of pests and reduce the source of pests.

First, how does the newly-produced Chinese cabbage treat bugs?

1, drug use

(1) Generally, the mixture of beta-cypermethrin, emamectin benzoate, chlorantraniliprole suspension and imidacloprid can be sprayed 1 time 2-3 days after the emergence of Chinese cabbage, and then sprayed 1 time every 5 days.

(2) It should be noted that because the newly emerged Chinese cabbage is tender, it is recommended to use pesticides with no residue, good insecticidal effect and low toxicity.

Step 2 use poison bait

(1) When Chinese cabbage emerges, phoxim can be mixed in chopped fresh vegetables, and then poisonous bait can be spread around the vegetable field at night.

(2) It should be noted that poison bait should not be sprinkled on cabbage seedlings to avoid phytotoxicity.

Step 3 remove weeds

(1) Because pests usually hide in weeds and cause harm, it is necessary to clean up the surrounding weeds in time, destroy the living environment of pests and reduce the sources of pests.

(2) Herbicides can also be used reasonably to eliminate weeds before Chinese cabbage emerges and prevent pests from hiding in weeds.

Second, how many days are there in the seedling stage of Chinese cabbage?

1, seedling time

The seedling stage of Chinese cabbage is generally about 45 days, but the seedling stage will change because of different varieties of Chinese cabbage, so how long the seedling stage of Chinese cabbage depends on the actual situation.

2. How to manage the seedling stage?

(1) After the emergence of Chinese cabbage, it is necessary to strengthen water management, ensure that the soil is moist, and make Chinese cabbage grow better. It should be noted that watering should be carried out reasonably according to the actual situation. If the vegetable field keeps water well, water it every two days 1 time, 1 day 1 time.

(2) In order to avoid the competition between weeds and Chinese cabbage seedlings for nutrition, it is necessary to uproot weeds and prevent Chinese cabbage seedlings from growing badly.

(3) During the growth of small white seedlings, it is necessary to ensure proper illumination, but if the temperature is too high and the illumination is too strong, it needs proper shading, and at the same time, when the temperature is relatively low, it is necessary to pay attention to heat preservation to ensure a suitable living environment.