Peach cancer cancer prevention?

The symptom of this peach root cancer is the formation of cancerous tumors in the affected roots. The shape, size, and texture of cancerous tumors vary from host to host, and are usually spherical or oblate spheroids, and they can also heal into indeterminate shapes. The number of tumors is 1-2, and as many as 10 or more. The size of the tumor is very different, as small as beans, as large as walnuts and fists, the largest diameter of up to several centimeters to tens of centimeters. The cancerous tumors on seedlings are generally only walnuts, and the vast majority occur in the healing parts of scions and rootstocks. It is milky or slightly reddish, smooth and soft at birth. After that, it gradually turned brown and dark brown, lignified and hard, and the surface was rough and uneven.

The symptoms of seedlings showed symptoms: development was blocked, growth was slow, plants were short, yellow leaves were severe, and premature aging. Adult fruit trees suffer from small fruits and shorten the age of trees. Pythium root cancer is a bacterial disease, which mainly damages the roots and roots and necks and forms tumors. It causes serious and poor growth of peach trees. The plants are dwarf and the quality of fruit is poor. In severe cases, the whole plant dies. The pathogenic bacteria live in cancerous tissues or in the soil and can spread through rainwater runoff or irrigation water and diseased seedlings and invade through wounds.

Incidence conditions are: temperature and humidity, according to the tomato inoculation test, the formation of the tumor at 22 °C is the most suitable, 18 °C or 26 °C formed when the tumor is small, 28 °C ~ 30 °C when the tumor is not easy to form; soil physical and chemical properties At pH 6.2 or above, it is most suitable for the infection of pathogens. However, when the pH reaches 5 or lower, the bacteria cannot infect. The incidence of soil viscous weight and poor drainage is high. The incidence of sandy loam with loose soil and good drainage is less. Grafting methods, in the nursery, there is more chance of infection by grafting, and the incidence rate is higher; grafted grafting is used. It is rare to get sick; in addition, the roots are injured, but also conducive to the invasion of bacteria, increase the incidence of the disease.

Control measures:

1. When planting on alkaline soil, appropriate application of acidic fertilizers or organic fertilizers, such as green manure, should be applied.

2. When a tumor is found on the fruit tree after colonization, first remove the cancerous tumor with a sharp knife and then disinfect the incision with 1x copper sulfate solution or 50x antibacterial agent 402 solution, and then apply Bordeaux slurry for protection; also use 400 units of chain. The incision was coated with penicillin and protected with petroleum jelly. The tumor that had been cut off was immediately burned. The soil around the diseased plants can be disinfected with 2000 times liquid of antibacterial agent 402.

3, timely control of underground pests to reduce the incidence of the disease.

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