PREFACE

These two volumes of Acta Horticulturae n° 550 are the Proceedings of the 18th International Symposium on Virus and Virus-like Diseases of Temperate Fruit Crops - Top Fruit Diseases.

Invited and keynote speakers and selected authors of offered oral papers and posters had the opportunity to submit their manuscripts for publication in this volume of the series Acta Horticulturae.

Submitted manuscripts were reviewed by the Editors and amended according to the referee suggestions prior to acceptance.

The ISHS acknowledges the cooperation received from the Editors on reviewing the manuscripts which was a significant contribution to the overall quality of the publication.

The ISHS Board of Directors