What is the symptom of metasequoia red blight?
The symptom of red blight of Metasequoia glyptostroboides is that the disease usually starts from the lower branches and leaves of Metasequoia glyptostroboides, gradually develops and spreads upward, and finally leads to the death of the whole plant. The susceptible branches and leaves produce brown spots at the beginning, then expand into dark brown, and then the branchlets and withered branches turn brown and die. The disease can also spread to green branchlets, forming sunken brown ulcer spots that surround the main stem and cause the upper part to die; or do not surround the main stem, but cannot heal for a long time, with the growth of the main stem, the ulcer sinks deeply into the trunk, forming trench rot, and the young tree base cadres produce irregular grooves and become deformed. Under moist conditions, the disease spot produces black dots. It is the fruiting body of the pathogen.
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Management and propagation techniques of Metasequoia glyptostroboides
Metasequoia glyptostroboides is suitable for warm and humid climate, cool summer, snow but not cold winter, annual average temperature 13 ℃, extreme lowest temperature-8 ℃, extreme highest temperature 35.4 ℃, frost-free period 230 days; annual precipitation 1500 mm, annual average relative humidity 82%. The soil is acid mountain yellow soil, purple soil or alluvial soil, and the pH value is 4.5 Murray 5.5. Mostly born in the valley or foothills near the gentle terrain, deep soil layer, moist or slightly stagnant water, strong cold resistance, strong water and moisture resistance, can grow in light saline-alkali land
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Technology of sowing and raising seedlings of Metasequoia glyptostroboides?
The techniques of sowing and raising seedlings of Metasequoia glyptostroboides are as follows: first, seed collection: Metasequoia glyptostroboides blossoms in the early and middle of March, and cone formation period from mid-October to early November of that year. Seeds can be collected when the fruit scales change from green to yellowish brown, fissured, and a small number of seeds protrude. After the cones are harvested, the cones are spread out or slightly exposed to the sun, the scales are opened, and the seeds can be removed. Second, seed treatment: soak the seeds in cold water for 3 to 5 hours before sowing, so that the seeds can fully absorb water and expand, so as to facilitate germination and ensure neat seedling emergence. Third, sowing: from late March to April
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