(1) Round root disease: It is a root rot caused by several kinds of fungal infections. The pathogens are all indigenous bacteria, and they can live in the soil for a long period of time. As long as the development of the roots of the tree is weak, the talents are invaded. Drought, lack of fertilizer, salinization of soil, serious erosion of water and soil, soil compaction, poor ventilation, excessive effects, overgrown weeds in orchards, and serious pests and diseases all contribute to the development of root rot.
(2) Root rot: The pathogens overwinter in the soil with the diseased body. As long as the sick body is not smashed, the bacteria can survive for a long time. The extension of disease in the orchard is dependent on the transfer of bacteriocins and diseased tissue. When the pellodes come into contact with the roots, small branches occur and they invade directly into the roots. The mycelium develops rapidly in the roots, excreting toxins to kill the host cells, penetrate the cortical tissue, and kill or circumcise the cortex. It can also invade the xylem, often forming many black lines within the xylem. The old orchard or diseased trees have become more and more renewed; the lack of sand and fertilizers and water, and the weak orchard's weak orchard are also more serious.
(3) Bletillariasis: The pathogens in the root neck or in the soil are overwintering, and the development period in the following year can be from the upper and middle of April to the end of October. In July and August, it is cold and rainy, and the disease is heavy. The pathogens are circulated in close proximity by rainwater and watering; the seedlings carried by the seedlings are important pathways that spread far and wide.
(4) Purple feather disease: It is a root disease caused by fungal injury. The bacteria live in the soil or with the diseased body in the soil and survive in the soil for many years. When the situation is appropriate, the bacteria can directly invade the fibrous roots and gradually damage the lateral roots and the main roots. Diseases and roots contact, watering, and cultivators can also be transmitted diseases. Diseased seedlings are the main gateway to distant disease transmission. The orchard or weakness of the trees is easy to develop.
(5) White feather disease: Root rot caused by fungal injury. The pathogens overwinter in the soil with the diseased roots. When the conditions are right, the bacteria first attack the soft tissue of the new root of the fruit tree, and the damaged fine roots will harden and decay, and then gradually extend to the thick root. Sick and healthy roots can also be transmitted through disease. Because pathogens can infect a wide range of seedlings, the orchards that were reconstructed from the old forest lands became very serious.
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