Introduction iron chlorosis of food crop plants and fruit trees grown on alkaline , or calcareous soils is a widespread agricultural problem in the world 碱性及钙质土壤上粮食作物和果树的缺铁现象在世界范围内普遍存在。
Leaves show bright yellow interveinal chlorosis , usually more acutely in apical areas and in younger leaves followed sometimes by bleaching and scorching 叶片脉间黄化，通常在叶尖和嫩叶上更为严重，有时转变成白化并枯黄。
Produced by pseudomonas syringae pv . atropurpurea , a pathogen of oats and pseudomonas syringae pv . glycinea . the toxin causes chlorosis and streaking in oats 丁香假单胞菌的两个致病变种可产生此毒素，这种毒素造成褪绿和条点。
Blotchy irregular interveinal fading and orange - yellow chlorosis of older leaves , margins culed and sometimes scorched ; younger leaves remaining green 甜菜锰中毒：带有不规则斑点的叶脉间褪色，老叶变为桔黄色，边缘卷曲，有时枯萎，幼叶保持绿色。
Profuse , small yellow - green chlorosis areas between dark green veins of older or mid - stem leaves , followed by numerous small brown necrotic spots 缺锰番茄叶片：老叶或茎中部叶片的深绿色叶脉上有大量的失绿黄化小区，随后转变成大量褐色坏死小斑点。
Older leaves have ivory - tinted necrotic spots and shreaks coalescing into larger scorched areas ; some leaves show pale ( faded ) yellow chlorosis over whole surface of apical regions 缺钾的大麦叶片：老叶出现灰白色斑点，逐渐连在一起呈烧焦区域，有的叶片黄化一直到叶尖。
Younger leaves faded green and lusterless ; older leaves marginal scorch , interveinal blotchy chlorosis , necrotic patches bleaching and withering ; characteristic of some soil acidity conditions 甜菜锰和铝合并中毒：幼叶褪绿失去光泽，老叶边缘枯黄，脉间有坏死褐色斑点，接着白化，枯萎。这是酸性土壤特有的。
Irregular marginal and interveinal yellow green chlorotic areas , followed by general interveinal chlorosis and profuse brown necrotic spotting and scorching , typical also of field conditions 菜豆锰中毒：不规则边缘和脉间区开始黄绿色，接着全部脉间失绿，并有大量褐色坏死斑点，最后枯萎。也是典型的田间情况。
Older leaves ( except sometimes the first leaf and also cotyledons ) show bright yellow or orange blotchy interveinal chlorosis , leaf margins are inrolled . tips of leaflets scorch and leaves wither 番茄缺钼叶片：老叶（除此之外第一片叶和子叶有时也会）出现嫩黄色或橙色斑点的叶脉脉间失绿，叶缘不卷曲，叶尖端枯萎，叶片脱落。
Almost white interveinal chlorotic banding in oblique patches . an “ indicator ” condition for nickel excess which is quite distinct from yellow - green or yellow interveinal chlorosis caused by simple iron deficiency 镍中毒的燕麦叶片：脉间几乎都是带有斜斑的白带；镍过剩的显示症状不同于由单独缺铁引起的脉间褪绿黄绿化或黄化。
