Profuse brown necrotic speckling of leaflets usually close to, or just within marginal areas which are initially green but later develop narrow brown scorched rims and then shrivel.

 
  • 缺钾的苜蓿叶片:大量褐色坏死斑点经常在叶尖边缘附近或叶缘上,最初是绿色但不久就扩展成狭小的褐色烧焦状边缘,直至枯萎。
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