由于炎夏高温,施肥过度,土壤过湿、板结、透气性差,假鳞茎受机械损伤等原因,兰花很容易感染褐腐病。发病多是先在一、二年生植株的叶基部和假鳞茎上出现水渍状块斑,随之受害部位逐渐变软,呈现淡褐色直至深褐色。同时,假鳞茎的输导组织变为黑色,中心叶片萎蔫,由下而上发黄。又因兰花是集生成丛,假鳞茎相连,病菌通过假鳞茎的输导组织及外部接触传染,很快就会蔓延到病株周 Due to the high temperature in summer, over fertilization, soil over-wet, compaction, poor ventilation, pseudobulb by mechanical damage and other reasons, orchids are susceptible to brown rot. Occurrence is first in the biennial plant leaf base and pseudobulb appeared water stains patchy, followed by the damaged parts gradually softened, showing a light brown until dark brown. At the same time, the tissue of the pseudobulb became black and the center leaves wilted, turning yellow from bottom to top. Because of the orchid is set to produce Cong, pseudobulb connected to the bacteria through the pseudobulb transmission organization and external contact with the infection, will soon spread to the diseased plant weeks