Eight Immortals rosette spot
[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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Botrytis cinerea
The original producing areas and introduction areas of eight Immortals such as Zhejiang, Shanghai, Jiangsu, Hebei and Beijing all occurred in varying degrees. It harms the flowers, buds and tender shoots of many kinds of flowers and trees, such as eight immortal flowers, rose, pomegranate, green peach and so on, causing the injured part to become soft and rotten and reduce the ornamental value. The symptom spot mainly occurs on the flower, initially produces waterlogged irregular spots on the petals, and then gradually expands, which can spread to the whole Corolla and inflorescence. When the bud is killed, it also produces irregular waterlogged spots, which can be extended to the whole bud, and finally the bud becomes soft and rotten and cannot open. Tender shoot quilt
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An introduction to the eight Immortals
The eight Immortals, also known as Hydrangea and Ziyang Flower, belong to the genus Saxifragaceae. The eight Immortals flowers are white and plump, large and beautiful, and their colors can be red and blue, pleasing to the eye and spirit. They are common potted ornamental flowers and trees. The eight Immortals are native to China and Japan. It was introduced to England in 1736. Cultivation is more common in Europe, Holland, Germany and France. Red, blue and purple flowers can be seen in florists. There are also a lot of Immortals planted in front of small gardens and buildings. At present, Germany Lampjon Gephrazon (Ramp)
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