First, the onset of symptoms in the absorption of the root disease, the formation of reddish-brown round spots, lesions expand each other to connect gradually into the xylem, xylem become brown and even die. In the aerial parts, the leaf clusters appear wilting and the leaves are curled up and deformed. The leaves are small and light in color. The leaf margins develop inward or expand from the main vein to the inside. There is a clear red zone between the diseased part and the healthy part. Shedding, the buds do not crack or the rate of fruit set is very low. The branches gradually lose water, shrink or die from top to bottom. Some of the tips and edges of the disease when the dead, generally not fallen.
Second, the reasons for the occurrence.
1, soil compaction, poor grain structure. The county's grape base is mainly in the northern part of the county, most of which is dry or semi-arid areas. 75% of the plots have not been cultivated for many years, resulting in soil compaction, poor soil permeability, difficulty in breathing the roots of the grapes, and the root rot is a soil habit. Home bacteria, rot in the soil, when the tree is weakened, the tree is infected, the bacteria can be transmitted by the water in the soil, underground pests, soil with bacteria, can be spread with the disease, and not deep-turning, creating for the bacteria A good place to live.
2, human factors. Gardening tools and wounds can spread and invade with disease. Once conditions are right, infection can be completed within 3 days.
3, long incubation period. After infestation, the tree is not sick, but is lurking. When the tree vigor is weakened or infected to a certain extent, the symptoms suddenly appear. It is usually the first year of infection, and symptoms appear only after 2-3 years. Symptoms appearing on the ground are divided into two types, one is the symptoms of the whole plant, and the other is the local appearance of symptoms, that is, the wilting phenomenon occurs on individual branches of a tree, while the rest of the branches grow normally. Usually 2-3 years the whole plant died.
Third, prevention and control measures
1. Reasonably build the park. Avoid the construction of gardens in the orchards. When constructing a garden, you must disinfect the soil and improve the soil. For example, sprinkle 300 times quinolinone on the ground; apply wood ash or ferrous sulfate on the ground to change the pH of the soil and destroy the living environment of the bacteria.
2, using virus-free seedlings to build gardens. Try to use grafted virus-free seedlings to build gardens, and grafted rootstocks like Beida and Kyoho.
3, to improve the cultivation conditions, the implementation of grass cultivation, timely watering and timely drainage to prevent soil erosion, the tree is a reasonable load to avoid the size of the annual results. Strengthen prevention and control of pests and diseases on the ground.
4, pharmaceutical control. Before germination and initial symptoms, 200-500 times of copper sulphate or Baume 1 degree lime sulfur agent or agricultural resist 120 water agent 200 times or quinolinone 300 times were used for root filling. When irrigating, use 10-15 kg per plant. After the diseased trees were found in the early spring, the soil was applied to the US, and 100 grams of each plant was sprinkled under a tree plate. The soil was deeply soiled and mixed with the soil and then watered. After the diseased tree was found in the growing season, roots were immediately plucked and 10 times liquid was added to the wound, or Baume 3 degree lime sulfur.
Before germination, the roots of the diseased plants found in the previous year were air-dried, that is, the roots and stems were exposed. After drying for 7-10 days, the wounds were disinfected with 30-50 times of Fumeiyu and applied to fermented and decomposed cake or chicken manure. Cover soil watering.
Second, the reasons for the occurrence.
1, soil compaction, poor grain structure. The county's grape base is mainly in the northern part of the county, most of which is dry or semi-arid areas. 75% of the plots have not been cultivated for many years, resulting in soil compaction, poor soil permeability, difficulty in breathing the roots of the grapes, and the root rot is a soil habit. Home bacteria, rot in the soil, when the tree is weakened, the tree is infected, the bacteria can be transmitted by the water in the soil, underground pests, soil with bacteria, can be spread with the disease, and not deep-turning, creating for the bacteria A good place to live.
2, human factors. Gardening tools and wounds can spread and invade with disease. Once conditions are right, infection can be completed within 3 days.
3, long incubation period. After infestation, the tree is not sick, but is lurking. When the tree vigor is weakened or infected to a certain extent, the symptoms suddenly appear. It is usually the first year of infection, and symptoms appear only after 2-3 years. Symptoms appearing on the ground are divided into two types, one is the symptoms of the whole plant, and the other is the local appearance of symptoms, that is, the wilting phenomenon occurs on individual branches of a tree, while the rest of the branches grow normally. Usually 2-3 years the whole plant died.
Third, prevention and control measures
1. Reasonably build the park. Avoid the construction of gardens in the orchards. When constructing a garden, you must disinfect the soil and improve the soil. For example, sprinkle 300 times quinolinone on the ground; apply wood ash or ferrous sulfate on the ground to change the pH of the soil and destroy the living environment of the bacteria.
2, using virus-free seedlings to build gardens. Try to use grafted virus-free seedlings to build gardens, and grafted rootstocks like Beida and Kyoho.
3, to improve the cultivation conditions, the implementation of grass cultivation, timely watering and timely drainage to prevent soil erosion, the tree is a reasonable load to avoid the size of the annual results. Strengthen prevention and control of pests and diseases on the ground.
4, pharmaceutical control. Before germination and initial symptoms, 200-500 times of copper sulphate or Baume 1 degree lime sulfur agent or agricultural resist 120 water agent 200 times or quinolinone 300 times were used for root filling. When irrigating, use 10-15 kg per plant. After the diseased trees were found in the early spring, the soil was applied to the US, and 100 grams of each plant was sprinkled under a tree plate. The soil was deeply soiled and mixed with the soil and then watered. After the diseased tree was found in the growing season, roots were immediately plucked and 10 times liquid was added to the wound, or Baume 3 degree lime sulfur.
Before germination, the roots of the diseased plants found in the previous year were air-dried, that is, the roots and stems were exposed. After drying for 7-10 days, the wounds were disinfected with 30-50 times of Fumeiyu and applied to fermented and decomposed cake or chicken manure. Cover soil watering.
Laiwu Manhing Vegetables Fruits Corporation , https://www.manhingfood.com