Members of the ProMusa network have joined forces to take on the challenge posed by banana streak viruses (BSV). DNA sequences of these badnaviruses are integrated in the B genome donated by the wild species Musa balbisiana. The ability of some of the sequences to form infective particles has led to restrictions on the distribution and use of B-genome-rich cultivars. Certain institutions have even stopped using cultivars containing the B genome in their breeding schemes. But if these cultivars are anything like their balbisiana ancestor, they could be more tolerant to drought than cultivars derived only from Musa acuminata, which donated the A genome, and as such play an important role in safeguarding future banana production against the effects of climate change.