1 Implement strict quarantine. It is prohibited to import citrus seedlings, scions, rootstocks, seeds, fruits, etc. from the ward. If it is necessary to introduce citrus propagation material from the ward, it should be planted in the isolation zone. After 1 to 2 years, no ulcer disease can be confirmed before planting in a disease-free zone.
2 application of disease-free seedlings. Nurseries should be located in disease-free areas with no citrus plants above 1 km. Rootstock seeds should be harvested from disease-free fruits and harvested from disease-free or disease-free orchards. Rootstocks and joints must be sterilized before entering a disease-free nursery. During the nursery period, it was found that the diseased plants should be burned down in time, and the nearby healthy seedlings should be sprayed to protect the seedlings. The seedlings in the nursery should be subject to strict quarantine. After the disease is confirmed, the nursery is allowed to exit the nursery.
3 Strengthen the management of fertilizers and waters to make them uniform and tidy. During the shoot stage, especially in the autumn shoot stage, the prevention and control of leaf miners should be done in time. If it is found that the diseased plants should be excavated, burned, and sprayed to protect the surrounding healthy seedlings, then replant with disease-free seedlings.
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