Acknowledgement
The authors thank Prof Nicola Stanley-Wall for the academic supervision, Prof Murray Grant for his assistance during HPLC analysis of plant defence hormones, Prof Jurriaan Ton for initial advice on the project, laboratory access, resources, support and intellectual input, Dr Katherine Wright for her support during the confocal microscopy analysis, Dr Colin Alexander for his help with the statistics described in the paper and Dr Mike Roberts for providing spores of B. cinerea and extremely valuable input with the microarray analysis. We thank ChiPro GmbH for providing the commercial formulation of chitosan. We are grateful for financial support from the Rural and Environmental Science and Analytical Services (RESAS) Division of the Scottish Government (2011-16) under its Environmental Change and Food, Land and People Research Programmes. This work is funded by AHDB (HDC) Studentship CP105 was secured by A.N and N.H to support D.DV doctoral programme, and the BBSRC Future Leader Fellowship BB/P00556X/1 and BB/P00556X/2 to E.L.