Prevention and Control Techniques of Rime Disease of Chinese Fir

Taxus chinensis var. syriacus is a common branch disease of Yunnan Keteleeria. The disease infects the branches of the Chinese fir and the trunk of the saplings, which is harmful to young trees.
Symptoms: At the early stage of the disease, the affected part develops a slightly spindle-shaped enlargement and gradually develops into a spindle-shaped tumor with a slightly rough surface. In the late spring and early summer of the second year, a cylindrical rust spore was grown from the cortical fissures of the diseased part. When the rust and spores are mature, they break apart from the edges and fall off in flaky shapes, releasing a large amount of brown powdery rust spores. The growth and development of the tumors above are significantly affected. The branches are thin, the needles are sparsely short, and gradually wither and die. The disease can spread downward along the stems. New tumors develop in the lower part of the original tumor, and the rust spores appear on the tumor in the following year. Rust spores, until the death of diseased branches or saplings.
Pathogen; the pathogen is Perideridermium kunmingense Ren, which belongs to the basidiomycotina, cyperomycetes, and rust fungi.
Incidence pattern: Pathogens belong to single host parasitic rust. The pathogenic bacteria invaded from the shoots and lateral buds of the plants, and the spindle-shaped swellings began to appear in the second year after the invasion. At the end of the third year in the late spring and early summer, cylindrical rust spores appeared in the cracks of spindle-shaped tumors. It usually takes 2-3 years from the intrusion to produce the rust spore. Once infestation centers are established, diseases often continue to occur year after year and continue to spread.
Prevention and control: 1 reduce the source of infection: remove the roots of susceptible saplings and diseased plants. 2 Chemical control: spraying protective agent before onset to prevent infection. The diseased plants should be sprayed and controlled to protect the seedlings from infection. 3 It is forbidden to plant trees with diseased seedlings.

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Delivery Date: within 30 days.

Delivery Place: Xiamen port,China

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