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柑桔黄龙病是我国柑桔生产中最危险的一种传染病,具有毁灭性。(一)发病规律:病原菌通过接穗、苗木和木虱传播。柑桔品种中耐病性弱的为蕉柑、福桔和茶枝柑等;抗病性较强的有温州蜜柑、甜橙、柚和柠檬;抗病最强的是枳壳,在田间不表现症状。(二)症状识别:(1)枝叶症状。刚染上黄龙病的柑桔树,秋季在树冠外围出现1—2条黄梢。到了冬季病状加重,这时一般不落叶。第二年秋季,在病梢周围出现一丛黄梢,迅速蔓延全树。黄
Citrus Huanglongbing is one of the most dangerous infectious diseases in China’s citrus production, which is devastating. (A) the incidence of law: pathogenic bacteria through the scion, seedlings and psyllids spread. Among the citrus cultivars, the disease resistance was weak, such as banana, balsam orange and citrullus lanatus, and the resistant ones were mandarin, orange, grapefruit and lemon. The strongest resistance was citrus aurantium which did not show in the field symptom. (B) Identification of symptoms: (1) foliage symptoms. Citrus trees just stained with Huanglongbing, the emergence of 1-2 yellow tips in the crown outside in the autumn. To winter aggravate, then generally do not fall leaves. The following autumn, a cluster of yellow shoots appeared around the shoot, spreading rapidly across the tree. yellow