IOBC-WPRS Bulletin Vol. 13 (1), 1990

Proceedings of a meeting of the Subgroup on pear orchards of the Working Group: "Integrated Protection in Fruit Orchards",
Changins/Nyon (Switzerland), 28 June-1 July 1988.
Edited by A. Stäubli & Nguyen Thanh-Xuan.
ISBN 92-9067-026-6 [81 pp.].