Apple mosaic disease is a kind of virus disease that is commonly seen in orchards. The diseased fruit trees are weak.
Symptoms mainly form various types of bright yellow lesions on the leaves, and the symptoms vary widely.
1 mottled type, usually starting from the small veins, the shape of the lesion is irregular, the size is not equal, bright yellow, clear edges. Sometimes several lesions fuse together to form large lesions;
2 mosaic type, irregular spots, large light green and dark green and white discoloration, the edge is not clear 3 spots network type, along the veins chlorosis, and spread to the nearby mesophyll, sometimes Only the main vein and the branch vein yellow, the discoloration part is wider; sometimes the main vein and the small veins show a relatively narrow yellowing, such as a reticular pattern.
4 rimmed type, with only the edges of leaves yellowed;
5 ring type, round, elliptical, bright yellow ring spots on the leaves, or nearly ring-shaped markings. Under natural conditions, multiple types of symptoms occur on the same tree.
The pathogens were viruses, apple mosaic virus, Tula apple mosaic virus, Lee necrotic ring spot virus, and apple mosaic.
Infection characteristics? After the tree is infected with the virus, it is toxic throughout the body, and it is a lifetime hazard. Symptoms appear shortly after germination, rapid development from April to May, followed by slowing down, basically stopped developing from July to August, and even appear latent phenomenon, after the autumn shoots develop again. In severe cases, fallen leaves appear in late May, with an average reduction of about 30%. Seeds generally do not transmit virus, but in natural situations, seedlings of sea lice seeds sometimes have mosaicism. Mainly spread through grafting. Scion and rootstock poisoning are the main sources of infection. The incubation period is 3-27 months. The virus can be inoculated onto the cucumber with the juice of the diseased young leaves. The occurrence of the disease is greatly affected by environmental conditions and the growth status of the host. When the temperature is 10 to 20°C, the light is strong, the soil is arid, and the decline of the tree vigor is conducive to the occurrence and spread of the virus.
Control methods
? 1, strict selection of virus-free scion and seedlings breeding apple seedlings.
2. Strengthen the inspection of the nursery and find that the diseased seedlings have been removed and burned.
? 3, strengthen disease tree management. Weeding trees and saplings that have lost the ability to lose results will be replanted with trees; if there are minor diseases in the big trees, organic fertilizers will be added, and appropriate shearing will be carried out to increase tree vigor and reduce damage.
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