Prevention and Control of main Diseases and insect pests of Metasequoia glyptostroboides
Sudden fall disease (blight): the fallen leaves should be removed and treated in time after falling leaves in autumn, and then 3~5Be stone sulfur mixture should be sprayed to the ground.
Metasequoia red blight: immediately after the end of the plum rain season, 1% Bordeaux liquid is sprayed on the crown for 5 times, once every 10 colors for 15 days, the disease can be controlled.
Color roll moth: the best control period is the early stage of larval sting (early and middle April). 50% fenitrothion, 40% dimethoate, 80% dichlorvos and pyrethroids can be used in the dry season (July and August). The larvae can be removed manually (even bags), collected and burned, or the larvae can be sprayed with 1000 times solution of fenitrothion.
Black-winged termites: the most effective way to control termites is to spray mirex from May to June. 3% carbofuran (USA) can also be used. L0~l5g is applied to each plant to prevent Rain Water from scouring and sun exposure, so as to maintain its efficacy for a long time.
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Seedling raising technique of Tianshan spruce
The main results are as follows: 1. Loam and sandy loam with better drainage and irrigation conditions should be selected for cultivating spruce seedlings. Spruce seeds are small, only by intensive cultivation can we improve the sprouting rate of seedlings and cultivate high-quality strong seedlings. The soil was ploughed deeply in autumn, with a depth of 250.30 cm, and 3 tons of base fertilizer was applied every 667m2. Combined with soil preparation for soil disinfection, 0.1% carbendazim or methyl thiophanate solution was sprayed with 1 kg solution for every 667 square meters. Make the bed with fine rake in spring, strive to break the soil finely, and irrigate the bottom water 3 days before sowing. II. Species
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Hardwood cuttings of Metasequoia glyptostroboides?
The hardwood cuttage techniques of Metasequoia glyptostroboides are as follows: 1-3-year-old mother trees are selected to take cuttings or collect seed strips from round ears in spring, and 1-year-old seedlings and their lateral branches can also be used as cuttings. The survival rate of cutting cuttings in the tip and middle section of seed strips is higher, generally cutting cuttings 10 to 12 centimeters long, slightly cut into 15 to 18 centimeters long. Before cutting, soak cuttings with 50mg NAA per kg for 20 to 24 hours, or soak cuttings with 500mg NAA for 3 to 5 seconds, or soak them with 100mg ABT rooting powder per kg.
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