由于不良的环境因素导致兰花的生长受阻 ,出现组织变色、畸形、萎蔫等变化 ,称作兰花生理性病害。生理性病害不具传染性 ,表现症状一致 ,不具发病中心 ,病情发展较慢。但不良的环境因子造成兰花生长不良 ,抗病力降低 ,可以诱发传染性病害的发生或加重。1.水分过多与过少造成的 Due to poor environmental factors led to the growth of orchids blocked, there are changes in tissue color, deformity, wilting and other changes, known as orchid physiological disease. Physiological disease is not contagious, the performance of the same symptoms, not the center of onset, the disease develops more slowly. However, bad environmental factors cause poor growth of orchids, reducing disease resistance, can induce the occurrence of infectious diseases or aggravate. 1. Too much water and too little caused