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What are the main pests and diseases of dawn redwood (Metasequoia glyptostroboides)? A full analysis of control methods

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Damping-off (seedling blight): after leaf fall in autumn, promptly clear away and dispose of fallen leaves, then spray the ground with 3-5Be lime-sulfur mixture. Dawn redwood red blight: immediately after the plum rain season ends, spray the canopy with 1% Bordeaux mixture 4-5 times, once every 10-15 days, to control the occurrence of the disease. Tortricid moths: the best control period is the early stage of damage when the larvae emerge from overwintering (early to mid-April); 50% fenitrothion, 40% dimethoate, 80% dichlorvos and pyrethroid insecticides can be used; in dry seasons (July and August) when outbreaks occur

Damping-off (seedling blight): after leaf fall in autumn, promptly clear away and dispose of fallen leaves, then spray the ground with 3-5Be lime-sulfur mixture.

Dawn redwood red blight: immediately after the plum rain season ends, spray the canopy with 1% Bordeaux mixture 4-5 times, once every 10-15 days, to control the occurrence of the disease.

Tortricid moths: the best control period is the early stage of damage when the larvae emerge from overwintering (early to mid-April); 50% fenitrothion, 40% dimethoate, 80% dichlorvos and pyrethroid insecticides can be used; in dry seasons (July and August) when outbreaks occur, larvae can be removed by hand (together with their bags), collected and burned, or sprayed with a 1000-fold dilution of fenitrothion to kill the larvae.

Black-winged termites (Macrotermes): the most effective method of termite control is to spray mirex ant bait in May and June to attract and kill the ants; 3% carbofuran (United States) can also be used, applying l0-l5g per plant; when applying, prevent rain washing and strong sun exposure to maintain the efficacy for a long time.

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