| 1. | 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。 |
| 2. | 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。 |
| 3. | Good control has been obtained by trimming all dead leaves , all broken green leaves hanging from the pseudostem , and leaves with necrotic spots over more than one third the lamina once a month
方法是：每月修剪一次死叶、挂在假茎上绿色坏叶及坏死斑点超过三分之一叶展部分的叶子。 |
| 4. | 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。 |
| 5. | General yellow - green or yellow interveinal chlorosis of fully expanded and younger leaves with major veins and most minor vein clearly defined green without appreciable adjacent green lamina ; some younger leaves with profuse interveinal brown necrotic spotting
甜菜缺铁：完全展开叶的脉间褪绿一般黄绿色或黄色，嫩叶的主脉和大部分侧脉明显显示绿色没有可察觉的相连的薄层；一些嫩叶脉间有大量褐斑。 |
| 6. | Foliage usually dark green ( or sometimes faded ) with dark brown or black necrotic spotting along major leaflet veins often appearing first on under surfaces and also along petiole ; profuse black spotting an sometimes black streaks along stems ) ( “ stem streak necrosis ” )
马铃薯锰中毒：叶片通常深绿（有时褪色） ，深褐色或黑色坏死斑点首先出现在表面内沿着主叶脉一直到叶柄，大量黑色斑点有时沿着茎连成一条黑色条纹（ “茎条纹病” ） 。 |
