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。