The objective of this project was to develop an alternative range of natural low cost pesticides based on mixtures of chitin and/or chitosan oligomers produced from shrimp shells. These materials are indeed already known as being able to induce systemic defence reactions in plants. It was proposed to develop a process to produce mixtures of chitin/chitosan oligomers using enzymes purified from micro-organisms selected in the Vietnam Type Culture Collection held by the Vietnamese partner.