Volutella buxi on buxus in Canada
Thank you for your question. Unfortunately, the term "pathogen" means many things, and without knowing the specific pathogen (fungus, bacteria, insect, etc.), a recommended 'cure' is impossible. We would need to know what symptoms the plant is having, see some photos of the damage, and know whether anyone has viewed the plant's tissue under a scope or a treatment has been attempted. Frankly, I think you will get faster and more reliable information by contacting the UBC Hortline Advice, whose contact information is listed here. Good luck!