橙类脚腐病症状是:树体根颈部感病后,皮层变褐色,呈水渍状,有酒糟味,进一步向根部侵染,根系皮层脱离,根群腐烂,如气候干燥,根颈部病斑干裂、变硬;如轻变发病,叶片发黄并逐步脱落,重度发病,则落叶后树体干枯。对该病害的防治方法:1、注意橙类园的清沟排水,降低地下水位。2、选用抗病砧木,适当提高嫁接部位,一般在离地面10厘米以上。定植橙类时。砧木部分不要栽得过深,要露出地面。3、对轻微发病的始病树,对发病部位用刀刮除病斑后,用2％硫酸铜液或瑞毒霉400倍液或者杀毒矾 M8400倍液涂刷,并把病部周围的泥土更新,减轻再度侵染。4、对橙类成年老树或者已发生脚腐病的树,进行“接脚换根”。具体做法是:2月中下句,橙类春梢萌动 Orange foot rot disease symptoms are: tree root neck disease, the cortex brown, water-like, with wine bad taste, and further root infection, root cortex detachment, roots decay, such as dry climate, the neck Ministry spots dry crack, harden; such as the incidence of light changes, the leaves yellow and gradually fall off, severe disease, the deciduous tree dry. The prevention and treatment of the disease: 1, pay attention to the Orange Gully ditch drainage, lower groundwater level. 2, the selection of disease-resistant rootstocks, appropriate to enhance the graft site, generally 10 cm above the ground. When planting oranges. Rootstock parts do not planted too deep, to reveal the ground. 3, Slight onset of diseased trees, the site of the disease curettage lesions, with 2% copper sulfate solution or Thoromycin 400 times or anti-virus alum M8400 times brushing, and the disease around the soil Update, reduce the re-infection. 4, orange trees or old trees have foot rot occurred tree, “pin for root.” Specific approach is: mid-February sentence, orange spring shoots sprout