How to control the root rot of grape caused by root rot

Grape root rot disease first occurred on the fibrous root, forming reddish-brown round spots, the spot connection expanded, deep into the xylem, the xylem first turned reddish brown, brown, and finally became dark brown until death.

Grape root rot

Aboveground symptoms: ⑴ wilting type in grape growing season. The leaves wilted, the leaves curled upward, the leaves were small and light in color, the new shoots were difficult to grow, the buds shrunk without cracking or the fruit setting rate was very low, and the branches were dehydrated, wrinkled or withered. This type mostly occurred in plants over 4 years old. ⑵ green dry type. After root infection, the diseased plants with rapid development of the disease suddenly lost water and withered in the spring when the temperature was high and dry, and most of them developed inward from the leaf margin or extended from the main vein, and there was an obvious red halo zone between the diseased part and the healthy part. when the leaf is serious, the leaves fall off, and this symptom mostly occurs in the young. ⑶ leaf margin scorched type. It is not dry in spring, and the disease develops slowly. When the disease occurs, the leaf tip and edge are scorched, but the leaves are generally not deciduous. ⑷ branch withered type. The big branch corresponding to the rotting root died, the cortex became brown and sunken, the boundary between good skin and bad skin was clear, the necrotic cortex was peeled off in the later stage, and the xylem vessel turned brown.

Pathogen and infection. Fusarium oxysporum, Fusarium oxysporum and Fusarium oxysporum are mainly caused by Fusarium oxysporum, Fusarium oxysporum and Fusarium oxysporum. Most of the bacteria invaded from the wound, and the infection could be completed in 3 days when the conditions were suitable. After infection, the grapevine is strong and does not get sick, but lurks down until the tree is weak or infected to a certain extent, usually in the first year of infection and 3 years later.

Prevention and cure measures

1. Reasonable establishment of the garden. Avoid building a vineyard in continuous cropping land. If it is really necessary to build a vineyard, it is necessary to disinfect and improve the soil, such as spraying 100 times pentachlorophenol sodium on the ground, and spreading plant ash on the ground to change the pH of the soil and destroy the living environment of the pathogens. Ferrous sulfate and so on.

Avoid low-lying waterlogged wetlands to build a garden, if the groundwater level is more than 1 meter, high ridges should be used to plant or dig drainage ditches to prevent the water level from rising. Before planting, the planting ditches with a depth of 1 meter each were excavated according to the row spacing, and more than 5000 kg of organic fertilizer was applied per mu.

2. Virus-free seedlings were used to build the garden. Try to choose grafted virus-free seedlings to build a garden, and the grafted rootstocks of Beida and Jufeng are better.

3. Improve the cultivation conditions, carry out grass cultivation, timely watering and timely drainage, prevent soil erosion, reasonable tree load, and avoid annual fruit. Strengthen the prevention and control of aboveground diseases and insect pests.

4. Chemical control. When filling the root, each grape uses 10MUR 15kg. After diseased trees were found in early spring, 100 grams of each tree was sprinkled under the tree plate, deeply hoed the soil, mixed with the soil and watered.

Before sprouting, the infected grape plants found in the previous year were scraped to dry the roots, that is, the roots were exposed. After drying for 10 days, the wound was disinfected with 30-color 50-fold Fumet arsine, and the ground was disinfected with 100-fold pentachlorophenol sodium. Apply fermented cake fertilizer or chicken manure to cover the soil and water.