What is the broken leaf disease of citrus seedlings?

What is the broken leaf disease of citrus seedlings? What harm does citrus seedling broken leaf disease have? How to prevent and cure? Also ask experienced netizens to point out the harm and causes of citrus seedling broken leaf disease and treatment methods, which are listed below for netizens' reference. The harm of citrus seedling broken leaf disease: citrus broken leaf disease is caused by citrus broken leaf virus (CTLV), which mainly harms citrus trees with trifoliate orange and their hybrids as rootstocks. After the citrus trees of trifoliate orange and citrus orange rootstock were damaged, the grafted part of the rootstock and scion was enlarged and the leaf veins yellowed, which was similar to that caused by ring peeling. Peeling off the bark of the joint, it can be seen that there is a circle of constricted line between the scion and the xylem of the rootstock, driven by strong wind and other external forces, the joint of the diseased tree rootstock is easy to break and the fracture surface is smooth. After the degree of broken leaf disease aggravated, the plant became dwarf, the root system rotted, and even died. At present, there is a lack of effective control agents for citrus broken leaf disease, and planting virus-free seedlings is an important measure to prevent the occurrence of the disease. When choosing and purchasing seedlings, it is necessary to understand the situation of nursery seedlings to make sure that the seedlings purchased are virus-free plants. The cause of citrus seedling broken leaf disease: the infection source of citrus seedling broken leaf disease is mainly from diseased plants in orchards, which is generally transmitted by grafting, can also be transmitted by knife scissors contaminated by the sap of diseased plants, and can be transmitted to citrus orange through dodder, and no venomous insects were found. Identification and treatment of citrus seedling broken leaf disease identification methods of citrus seedling broken leaf disease: the commonly used woody indicator plants are Rusk orange, Troya orange, Carrizo orange, thick-skinned lemon and so on. The symptoms on Rusk orange are transparent macula, round or irregular shape, leaf margin defect, leaf deformity, slightly sunken longitudinal grooves on the stem, curved branches, and significant dwarfing in severe cases. Treatment method of broken leaf disease of citrus seedlings: when the rate of diseased plants is less than 20%, all are excavated, soil disinfection or replacement of new soil will be carried out, and virus-free citrus seedlings will be replanted after 6 to 12 months; when the rate of diseased plants is more than 20%, it can be taken to graft Gutou orange rootstocks or 2 rootstocks of fragrant oranges, and the yellowing tree potential can be restored after 1 year, or the rhizome base nutrient soil to promote the germination of new roots above the grafting interface. Click to get more citrus planting techniques click to get more fruit planting techniques