This should be because the disinfection of tools is not in place during puncture, which leads to the infection of mixed bacteria such as Penicillium.

It is suggested to prick according to the pricking principle: disinfect tools first, then more, first shallow, then deep, first thin, then thick, prick at the close joint of the material surface, do not take the film with you, and do not touch the raw materials. Don't stab the tumor, don't stab at the infected part of miscellaneous bacteria, don't stab at the temperature above 30℃, don't stab the small hole when the bag is too loose, and then stab the small hole when the mycelium is full. Large bags and wet bags should be properly perforated.

For your reference only

For the partially rotting stick, we can treat it by digging out the rotting bacterial block to a healthy mycelium, and then smearing it with quicklime solution or a slightly higher concentration of bactericide to control the further spread of germs. For fuel rods that have been completely burned, the bag can be broken and dried as soon as possible for reuse. When using contaminated materials, it is necessary to adjust the pH value with quicklime water and prolong the sterilization time. It is best to add new materials, which is beneficial to the growth of bacteria.

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I was delayed for a few minutes and couldn't answer in time. Please forgive me.

long live the understanding