I’m gonna be a contrarian voice here and say that while the “agroterrorism” thing is overblown, you’re still not supposed to move plant pathogens across international borders for very good reasons. The species concept is pretty vague for microbes anyway; you don’t know if your ID might be off or what introducing a new genotype of an already established species might do. The researcher should absolutely be aware of that and should have known better. Just do the paperwork and follow the protocols next time.