目前,在食用菌生产中存在着一个比较严重的问题,即菌种“退化”。尤其是生料生产的平菇更为严重。这里所说的退化,主要指如下表现:(1)在试管斜面上,菌丝细弱,气生菌丝多,呈棉絮状;(2)在原种、栽培种生产中,菌丝弱、长势慢,易感染霉菌(绿霉菌最多);(3)在生料栽培中,表现为“吃料”慢,抗逆性差,易污染,产量逐渐(或骤然)降低等。 At present, there is a serious problem in the production of mushrooms, that is, the strain is “degenerated.” In particular, raw mushroom production is more serious. The degradation mentioned here refers mainly to the following manifestations: (1) In the tube slope, the mycelium is weak and the aerial mycelium is numerous with cotton flocculent; (2) In the production of primary and cultivated species, the mycelium is weak and grows slowly , Susceptible to mold (the largest number of molds); (3) In the raw material culture, the performance of the “feed” slow, poor resistance, easy to pollution, the output gradually (or abruptly) decreased.