Bacillus thuringiensis (Bt) is the most important viable
biological agent for the control of CPB [14,15], the
insecticidal activity on which depend insecticidal proteins
secreted during plant growth (vegetative insecticidal
proteins, called Vip proteins), as well as parasporal
crystalline protoxins (Cry and Cyt proteins) [16–18]. Cry
toxins have been successfully used as conventional
sprayable bioinsecticides or engineered in transgenic
plants