Although I highly respect Lessard and his work with bananas, his book has many errors that should be noted to avoid confusion. There is still a lot of good information, however some of the information seems to be based off nothing but assumption or guesses. So although I still do like the book and enjoy looking through it, I would not recommend it as a completely reliable source of technical information.
If you really want to get in depth and learn about bananas, I highly recommend Simmonds 2 books, "Bananas" and "The Evolution of the Bananas". Both are excellent books that really cover almost all bases of banana biology (I got both from Abe Books for about $200 combined, ~70+130). Also if you want to know even more about things like cytology and genetics and how it relates to breeding and pollination and that kind of stuff, look up Ken Shepherd's "Cytogenetics of the Genus Musa", it is free for download from
http://bananas.bioversityinternational.org.