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Locust: During the entire growth period of autumn cabbage has harm, to the heaviest harm in the middle and late, can be controlled by the following methods: 1. With 10% imidacloprid 1500 times or 50% anti-inferiority WP 2000 ~ 3000 times spray. 2. Use 10% WP WP 10 grams per acre, water 50 kg, or 5% hypertonic butyl thiocarbacarb 30 to 40 mL, water 50 kg, evenly spray the opposite side of the blade, prevent and cure The effect is over 95%. 3. Use 500 grams of urea per acre, 125 grams of detergent, add 50 kg of fresh water, mix and spray after spraying. The effect is about 90%. Seed flies, ground tigers, and yellow striped flea beetles: Their larvae harm the roots of autumn cabbage, and adult yellow-jelly beetles harm the leaves of autumn cabbage, bite into small holes, and can eat seedlings. Chemical control: It is best to start from around the cabbage field and gradually eliminate it in the middle to prevent escape. Mix 90% trichlorfene or 50% phoxim with 10 kg of water, mix in 50 kg of wheat bran and crushed fresh vegetables to form a bait. Spread it on the ground around the autumn cabbage roots in the evening. In the case of severe damage to adults of the yellow-spotted beetle, the above pesticides may be used to dilute the water 1000 times and sprayed with 50 kilograms of liquid per acre. Pieris rapae, Plutella xylostella, Brassica juncea, and Helicoverpa armigera: their larvae are important pests in the early stages of autumn cabbage. The larvae before the 3rd instar is the critical period for chemical control, and can be used 5% Sulfochlor EC 2500 times or 2.5% enemies 800 times liquid spray, with 50 kilograms per mu.