一、冻害症状与防治 1.表现症状:①树干冻害:受冻后有时形成纵裂,树皮常沿裂缝脱离木质部,严重时外卷。②根茎冻害:受冻后,树皮先变色,以后干枯,表皮深褐色,以致脱落。③枝条冻害:轻微时只表现髓部变色,中等冻害时木质部变色,严重冻害时,冻伤木质部,待形成层变色时,枝条失去恢复能力。④花芽冻害:花芽发生冻害 First, symptoms and prevention of frostbite 1. Performance symptoms: ① trunk frost damage: sometimes formed after longitudinal cracking cracks, the bark often along the cracks from the xylem, the outer volume of severe. ② rhizome frost damage: frozen, bark discoloration first, after the dry, dark brown skin, so off. Â ’¢ branches frost damage: slightly when the performance of the discoloration of the medulla, xylem discoloration medium frost damage, severe frost damage, frostbite xylem, to be formed layer discoloration, the branches lose their ability to restore. ④ flower bud damage: flower buds freeze damage