There are five kinds of diseases that are prone to occur at the roots during the seedling stage: root rot, white peony root, white rot, root decay, and white feather disease. The corresponding control measures are as follows:
1. Root rot disease The root rot of seedlings has two types: bacterial root rot and round spot root rot. The former is a bacterial disease. The roots were killed as large as walnuts and smaller than bean-shaped tumors. The seedlings were found to be dwarfed and the leaves were yellowed and shed. The latter is caused by fungal damage, which is mainly caused by Fusarium infestation. This pathogen is lurking in the soil. When the environment is suitable, hyphae are produced and the roots of the forest are in contact and infested. Wilt-type, dry-type, leaf margin coking type, branches and so on. The branches were dry, the cortical necrosis was easy to peel off, and finally the whole plant withered and died.
2. After the infection of the roots of Bletilla striata, the diseased part was yellow-brown to red-brown with rot and more sap. The cortex tissue rotted into muddy, with sour taste and dead on the ground.
3. White rot The disease is a fungal disease. It is mainly transmitted through contact with the roots of the disease and healthy roots. After the disease occurs, it continues to spread around, causing other diseased seedlings to become infected. The sensible parts showed lavender, followed by black plaques, and the patches gradually turned white. There were also lipids in the roots of the pine seedlings. The above-ground parts of the diseased seedlings showed yellow or light yellow needles, short leaves, early fall and withered leaves.
Root decay disease caused by the fungal infection of the genus, needles, broad-leaved species and their young forests, mature forests will be infected. The main symptom is that after infection, the upper part of the seedlings of the seedlings are yellowed, the leaves fall early or the leaf shape is small, the branches and leaves are sparse, the branches wither and die; the conifer tree breeds in the rhizome. In the diseased root cortex affected by seedlings, dark brown rhiform mycorrhizal fungi are found on the surface of the roots and in the soil. When the topsoil of the seedbed extends and contacts the roots of other seedlings, it expands along the surface of the roots, causing infection of the main roots and lateral roots, causing the seedlings to wither and die.
5. White feather disease The disease is a disease caused by a fungal infection. It first invades the fibrous roots of the seedlings and then spreads to the lateral roots and the main roots. On the surface of the diseased roots, white or grayish-white hyphae form round black sclerotia at the roots of decaying seedlings. It mainly affects fruit trees, needles, and broad-leaved species.
Control methods
1. Disinfect seedbeds by disinfecting the seedlings. The bactericidal effect of a variety of root diseases better Pharmacy have 2000 to 3000 times the Green Hunter No. 1, Green Hunter No. 2, thiophanate-methyl, or use a new type of agent rot fungi in accordance with 800-1000 times fluid 3 cubic / cubic meter The amount of water poured on the seedbed. Irrigation is best done twice in the early spring and early in the summer when the bacteria begin to move.
2. Strengthen fertilizer and water management to enhance the growth of seedlings, improve disease resistance, open drainage ditch around the seedlings to reduce the groundwater level; timely drought in drought, conducive to robust root growth. After the seedlings enter the growing season, additional phosphorus and potassium fertilizers should be added to enhance the disease resistance of the plants. The diseased plants should be found in time, removed immediately, and brought out to burn out to prevent cross-infection and isolation of pathogens.
3. Immediately after the seedling disease occurs, medication should be taken promptly. The fungicide is a new type of agent used for the sterilization and disinfection of roots and the control of root diseases. It can be used to prevent and cure disease when the seedlings are diseased.
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