1. Before planting Chinese cabbage, 2.5-3.5 kg phoxim granules per mu can be used. After being mixed with chemical fertilizers and applied to soil, the eggs and larvae of the flies can be killed.
2, with sugar 0.5 kg, vinegar l kg, water 7.5 kg, plus 20 grams of trichlorfon powder, made into a mixture, in early August or so, in the field every 8-10 meters away digging a bowl of large pit According to the size of the pit, put it into a plastic bag, pour 100 grams of the mixture, and add a mixture every 10 days or so to kill a large number of adults.
3. When the Chinese cabbage grows to 2-3 true leaves, or 2.5% per acre with 1-1.5 kg of trichlorfon powder, or 0.5-1 kg of dimethoate powder per acre, dust the field on the ground to prevent Seeds fly into the field to lay eggs.
4. When the Chinese cabbage grows to 6-8 leaves, it can be mixed with grass ash, lime powder and 2.5% trichlorfon powder in a ratio of 2:1:1. It is spread around the vegetable root to prevent spawning and killing of the species fly. Dead larvae before their death.
5. When it is found that the cabbage in the field is damaged by roots, 90% of the crystals of dipterex can be used 1000 times, or 40% of Dimethoate 1500 times, and 50% of phoxim EC can be used as 2000 times. To irrigate the roots, about 200 grams of liquid per irrigating solution, to make the liquid flow from the heart of the cabbage to the rhizosphere, to ensure that the roots of the soil is moist, generally 1-2 times to irrigate the roots, you can kill the earthworms.
6. About 30 days after the cabbage is planted, use 1 kg of ammonia, add 1 kg of clear water, stir the roots, and irrigate about 150-200 grams per plant. Or combined with the autumn cabbage irrigation, the ammonia slowly poured into the running water for furrow irrigation, this will not only prevent the occurrence of mantle, but also play a role in top dressing.
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