Monitoring results of narrow leaved ash new invasive disease caused by Chalara fraxinea are shown in the paper. The disease caused great damage on ash in whole Europe and until now its presence is confirmed in more than 25 countries, including Serbia and neighboring countries (Bosnia and Herzegovina, Croatia). The characteristic symptoms of disease are necrotic lesions on shoots and trees (canker), dieback and bushy growth of diseased plants, premature decline of necrotic leaves and change of bark color. The aim of the paper was to determinate the distribution of disease in Vojvodina and to study the pathogen life cycle.