Fruit Root Cancer Prevention and Control Technology

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First, the damage symptoms in the affected area to form a spherical or spheroidal tumor, tumor size ranging from small as beans, as big as a fist, can also be clustered by a large number of small tumors larger cancer, its diameter up to tens of centimeters. The primary tumor was milky yellow with a light brown to dark brown gradient. The internal organization is gray, soft or spongy. Later, the internal organization was lignified. The exterior surface is rough and bumpy. Produce some fine roots on or around the surface. The surface of old mature tumors ruptures, or rots from the surface to the center, some tumors fall off from the base, and new cancers can be regenerated. After plant damage, the growth and development are hindered, the tree vigor is weakened, the tree age is shortened, the fruit tree results are poor, and the quality is reduced. In severe cases, the plants are gradually withering and even destroy the garden.
Second, the source of bacteria caused by the root cancer bacteria. The pathogenic bacteria live in the diseased tissue and in the soil (live for many years), and the pathogen spreads outward along with the diseased seedlings and diseased plants. In the garden, it can be spread by rain, irrigation water, and underground pests and nematodes. Germ development temperature is 10 °C ~ 34 °C, the best is 22 °C, lethal is 51 °C, acid range pH 5.7 ~ 9.2, the optimum pH 7.3.
Third, the path of pathogenic bacteria mainly through the wound (graft injury, mechanical injury, insect injury, frostbite, etc.) invade the parasitic plants, but also through the natural orifice (stoma) invasion. After the bacteria invade the plant, they can continue to multiply in the cortical cells of the parenchyma, and secrete irritating substances, so that the neighboring cells can accelerate the division and hyperplasia and form cancerous disease. After the pathogen enters the plant, it can potentially survive (latent infestation) and develop disease when conditions are right.
IV. Incidence and conditions
1. Every year's growing season can happen. It occurs most in August.
2. Alkaline soil is conducive to disease, less acidic soil disease.
3. The sandy loam with high humidity facilitates the onset of disease and the viscidity of soil and soil is less.
4. Seedlings grafting, seedlings, planting, buried in cold, cultivator, etc. cause wounds easily lead to disease.
5. The incidence of different types of different. The incidence of peach is more, and the incidence of almond trees is less.
6. The incidence of different rootstocks is different. The sweet cherries with cherry blossoms as anvil are highly susceptible and highly resistant to cherry cherries.
7. Disastrous weather leads to aggravation of diseases, such as cold injury and damage.
8. Other pests cause cancerous diseases, such as underground pests and nematodes.
V. Prevention measures
1. The rootstock with disease resistance and the disease-free scion were selected from the disease-free nursery stock, and the seedlings were cultivated in the field with no history and no trees. Do not apply or less fertilizer, nurturing strong seedlings.
2. External purchase of seedlings must look at the disease to guide the procurement work with the principle of "five no-buy", that is, not buying the nursery stock that was seedling-raising in the same year and the nursery stock that was out of the nursery that year; not buying seedlings that are promoted by chemical fertilizers; not buying nursery stocks with history and tumors; Purchase the seedlings of susceptible rootstocks; do not purchase seedlings that are subject to locust damage, freezing damage, and many underground pests.
3. Seedlings should be quarantined and quarantined. Seedlings should be carefully examined one by one, and those who are sick should be burnt (not to be left behind). The selected seedlings are soaked with "K84" biocontrol agent or treated with other drugs.
4. Before planting Before the seedlings are planted or when they are planted, root with copper sulfate 100 times for 10 minutes. After washing, protect the Bordeaux slurry. At the same time, use 50% phoxim poison baits to control the underground pests.
5. To prevent seedlings from sprouting, transportation, planting and management, etc., to prevent damage to seedlings.
6. To prevent frost damage during seedling period, special attention should be paid to cold protection. Management measures should be properly implemented during the tree-planting period to achieve high freezing resistance.
7. After planting and inspection after planting, if the diseased plant is found, it should be immediately removed and burned. For the original tree pit to replace the new soil, it is best to replant the following year.

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