樟树黄化病发生原因与防治对策

樟树黄化病是安庆市樟树的一种常见病害,严重影响了城市景观和绿化效果。对安庆市区樟树黄化病的症状、发病特点、发病原因的调查结果表明:樟树黄化病主要是由于缺铁而引起的生理性病害。症状主要表现为嫩梢黄化、整株黄化、梢头枯死和全株枯死。病害发生的主要原因是土壤质地太差,受建筑垃圾污染严重,导致土壤碱化,影响铁离子的有效吸收。街道两旁樟树的黄化率高,为39%,其中又以幼树黄化重,黄化率为54%。提出了土壤改良或改土为主,药液治疗为辅的防治对策。

Investigation of the Causal Factors of Camphor Tree Yellows and Control Measure

The camphor tree yellow is a common disease in Anqing city and the value of these tree landscapes were decreased seriously. The investigation of the symptom, characteristic and causal factors of the disease in Anqing city was made in this paper, The result showed that camphor tree yellow was a physiological disease, The symptom can be classified into the yellows of shoot and whole plant, died shoot and whole plant. The key factors that disease occur were the soil texture because of too clay and harden; and the soil was polluted by the building garbage and sewage resulting in high soft pH value, in which Fe element was hardly absorbed by plant. The disease incidence of plant in street was higher than that of campus and park, and the incidence of young plant was higher than that of old plant. Therefore, the control measures that treat soil improvement as key measure, and chemical as secondary one were suggested to gardeners,