MySheen

Eight Immortals rosette spot

Published: 2024-11-05 Author: mysheen
Last Updated: 2024/11/05, [distribution and harm] Hydrangeamacrophylla, also known as Hydrangea, is planted all over China, which is a deciduous shrub. There are more virus infections, and ringspot is the most common. Generally latent, the seriously ill are dwarfed, and there are few or no flowers. [symptoms] the leaves are shrunk and the stems sometimes show necrotic spots. When inoculated with diseased plants, the old leaves showed chlorotic spots, brown ring spots or oak leaves. [pathogen] virus HyRSV, also belongs to potato virus Y group. Particles linear, 47 in length

[distribution and harm] Hydrangeamacrophylla, also known as Hydrangea, is planted all over China, which is a deciduous shrub. There are more virus infections, and ringspot is the most common.

Generally latent, the seriously ill are dwarfed, and there are few or no flowers.

[symptoms] the leaves are shrunk and the stems sometimes show necrotic spots. When inoculated with diseased plants, the old leaves showed chlorotic spots, brown ring spots or oak leaves.

[pathogen] virus HyRSV, also belongs to potato virus Y group. The particles are linear and long 470~650nm × 13nm. The lethal temperature was 70-75 ℃. Dilution end point 10-5. The in vitro survival time was 210.35 days (at room temperature). This virus has distant serological relationship with potato X virus, cactus X virus, white clover mosaic virus and so on.

[incidence regularity] Baxian flower is the only natural host. Artificial inoculation can infect more than 20 kinds of plants. Qianrihong, fennel, cucumber and so on can be used as differential hosts. Primroses can be used as breeding hosts. The persistent root with disease is the main source of infection. Cuttings or branches can spread disease, and grafting or tools can also carry disease.

[prevention and control measures] pay attention to tool disinfection. The disease-free mother plants were selected for propagation or heat treatment at 38 ℃ for 4 weeks. Cultivate disease-resistant varieties.

 
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