Sounds like your not disinfesting the material properly. Contamination can
come from many sources,, noone on the internet is going to be able to help
you!! Maybe you have thrips or spidermites in your culture area.
> Hi, there:
>> Does somebody know why my plant tissue culture is easy to contaminated?
> Another question: how to sub-culture tobacco leaf? I directly plant tobacco
> leaf on the MST medium.
>> Thanks a lot.