1. culture: rotation culture, rotation for more than three years. 2. Fertilization: It is recommended to apply more organic fertilizer in production fields, combined with nitrogen, phosphorus and potassium to avoid partial application of nitrogen fertilizer. Irrigation with 100% biogas slurry can also effectively prevent the occurrence of pit disease. 3. Harvest: After harvesting Angelica sinensis in autumn, all weeds such as diseased plants and sheep's hoofs in the field should be thoroughly removed to reduce the primary source of infection in the following year. 4. Soil treatment: Before sowing Angelica sinensis in the field, mix 3% phoxim granules with 3 kg/mu of fine soil, then sprinkle it on the ground, turn it into the soil, or spray 1.8% avermectin EC 2000 times in the planting ditch.
Symptoms of angelica leaf disease: the lesion site is the root cortex, which is more common in the patent period of angelica. After the onset, when the root cortex tissue is brown honeycomb, it will rot to the junction of cortex and vascular bundle, some stem bases will turn brown and rot, and cracks or root hairs will appear on the surface of the diseased root. Plants on the ground are short, slow-growing, with small or wrinkled leaves.
The occurrence environment and conditions of Angelica sinensis hemp leaf disease: The disease is caused by potato stem rot nematode. Most insects move in 10 cm soil layer, and can move when the temperature reaches above℃, and move at 26℃, and overwinter as adults or eggs in diseased soil or residual soil. In Zhenping, Henan Province, it is harmful from seedling transplanting to harvest every year, and the peak period is May-July. Sandy soil has good permeability, soil water content 15%-20%, and the number of pathogenic nematodes is very large.
Control methods of leaf diseases of angelica sinensis;
(1) Don't choose the potato field of the previous crop for planting.
(2) After harvesting, completely bury or burn the sick and disabled.
(3) Don't plant it every year, but rotate it with Gramineae crops for more than 2 years.
(4) Apply dry chicken manure 150-200 kg per mu before planting.
(5) Ditching in the field 10- 15 days before planting, with a ditch spacing of 60 cm and a ditch depth of 15 cm. 65,438+00-65,438+05 kg of 20% dibromochloropropane particles per mu are evenly scattered in the ditch, then covered with soil and compacted, covered with plastic film, fumigated for 7-65,438+00 days, deflated for 3-5 days, and then transplanted with angelica seedlings. You can also use 1.5-2.5 kg of 30% emulsifiable concentrate to remove lines during soil preparation, and use 150-250 kg of water per mu, and then turn over the plough after spraying the surface.