Bacillus thuringiensis (Bt) is one of the bacterial entomopathogens most frequently studied as a
toxin producer. Its insecticidal activity was attributed to the parasporal crystals formed during the
stationary phase of its growth cycle, and released during sporulation. The efficacy of Bt is highly
sensitive to the environmental conditions; when exposed to UV light, the insecticidal proteins
undergoes to rapid degradation.
Considerable research has attempted to improve Bt field persistence using ultraviolet absorbers,
encapsulation and addition of clay granules to spray formulations.
The aim of this study was to investigate different encapsulation processes in order to obtain the
Bt-based formulations consisting of matrix-type microcapsules
