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一、症状及诊断: 柑桔对铁素敏感。深丘低山柑桔园易发生缺铁黄化。据典型地块调查,黄化程度从轻到重可大致分为四种情形:1、叶肉大部分为绿色,全叶呈不明显的绿色网纹;2、部分叶肉黄化,整个叶片呈明显的绿色网纹,部分网脉及主侧脉黄化;3、主、侧脉绿色,大部分叶肉及网脉黄化。仅叶片靠近叶柄处残存绿色;4、全叶黄白或近白色,有水浸状褐色斑块,仅主、侧脉近叶柄处存绿色。叶片轻触即落。无叶枝梢多枯死,树冠变小。果农反映是“一年青,
First, the symptoms and diagnosis: Citrus sensitive to ferritin. Deep hill hilly citrus garden prone to iron deficiency yellow. According to a typical block survey, yellowing degree can be divided into four categories from light to heavy: 1, most of the green leaves, the whole leaf was not obvious green reticulate; 2, some of the leaves yellowing, the entire leaves were obvious Green veins, some reticular veins and the main side veins yellow; 3, the main side veins green, most of the mesophyll and veins yellow. Only leaves near the petiole remaining green; 4, the whole leaf yellowish white or nearly white, there are flooded brown patches, only the main, lateral veins near the petiole save the green. Leaves touch down. No leaf shoots more dead, crown smaller. Fruit farmers reflect "a young,