Locusts are harmful during the whole growth period of autumn cabbage, and the most serious harm in the middle and late period, the control method: with 10% imidacloprid 1500 times or 50% anti-inferiority WP 2000 ~ 3000 times spray. Use 10% 蚜虱 net wettable powder 10 grams per 667 square meters, water 50 kg, or 5% hypertonic butyl thiocarbacarb EC 30 ~ 40 ml, water 50 kg, evenly spraying the front and back of the blade. Each 667 square meters of urea 500 grams each time, washing powder 125 grams, plus 50 kg of diluted water spray mix, the effect of 90%.
The larvae of the species fly, ground tiger, and yellow-striped flea jeopardize the roots of autumn cabbage. The adults of the yellow-striped flea jeopardize the leaves of the autumn cabbage, bite into small holes, and can eat seedlings. Chemical control is best started from around the cabbage field, gradually annihilate in the middle to prevent escape. Mix 90% trichlorfene or 50% phoxim with 10 kilograms of water, mix in 50 kilograms of wheat bran and crushed fresh vegetables to form a bait. Spread it on the ground around the cabbage roots in the evening. Yellow stripe beetle adults are most active at 26 °C with serious hazards. The above pesticides can be used for water 1000 times and sprayed with 50 kilograms of liquid for every 667 square meters.
The larvae of Pieris rapae, Plutella xylostella, Brassica juncea, and Helicoverpa armigera are important pests in the early stage of the autumn cabbage. It can use 5% of CPT cream 2500 times or 2.0% of the enemy to kill 800 times spray, 50 kg of liquid per 667 square meters.
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In a hydroponic system, plants are placed in nutrient-enriched water. Mediums such as gravels, sand or vermiculite can also be used. Thus plants which are placed in the water absorb the nutrients very easly. When the nutrients from the water starts finishing , water is recycled or additional nutrients are added.
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