Unasylva - No. 97-98

Vol. 24 (2-3)

1970

AN INTERNATIONAL REVIEW OF FORESTRY AND FOREST INDUSTRIES

Published by the Food and Agriculture Organization of the United Nations

ANNUAL SUBSCRIPTION:

U.S.$2.50 or 20s.

DOUBLE ISSUE:

U.S.$1.30 or 10s.6d.

Rates can be paid in local currencies when orders are placed through the authorized sales agents listed on the inside back cover.

Articles and extracts from Unasylva, if not specifically copyrighted, may be reprinted provided reference is made to the source. A cutting of any reprinted material would be appreciated. It should be sent to the Distribution and Sales Section, FAO, Via delle Terme di Caracalla, 00100 Rome.

FAO - The Food and Agriculture Organization of the United Nations was founded at Quebec, Canada, in October 1945 when its Member Nations agreed to work together to secure a lasting peace through freedom from want. The membership of FAO now stands at 121 nations.

Director-General

A.H. BOERMA

Unasylva - Published quarterly by the Food and Agriculture Organization of the United Nations.

Editor

LESLIE J. VERNELL

Started in 1947, this international review of forestry and forest industries is intended to present a range of interests as wide as that of the Department whose work it mirrors. Signed articles express the opinions of the authors and do not necessarily represent the views of the Organization.

Forestry Department

Assistant Director General

B.K. STEENBERG

Directors

JACK C. WESTOBY

R.G. FONTAINE

P.J. VAKOMIES

L.E. HUGUET

Cover. A seed stand of 120-year-old Scots pine (Pinus sylvestris) belonging to the Enterprise Kostelec Nad Cernymi Lesy, Skalice district Czechoslovakia. The Washington Consultation recommended the formulation of standardized methods for assessing stem, branch, crown, wood and resistance characteristics of forest trees, which could be internationally accepted. The assessment of stem straightness should be related to the proposed end use of the wood and to the age of the tree. - PHOTO SWIDELAR AND ZAVADIL

This electronic document has been scanned using optical character recognition (OCR) software and careful manual recorrection. Even if the quality of digitalisation is high, the FAO declines all responsibility for any discrepancies that may exist between the present document and its original printed version.

Forest tree breeding

R.Z. Callaham
Introduction

D.G. Nikles
1. Breeding for growth and yield

Carin Ehrenberg
2. Breeding for stem quality

J. Maddern Harris
3. Breeding improve wood quality

H.D. Gerhold
4. A decade of progress in breeding disease-resistant forest trees

W.H. Cram
5. Breeding for other high-yielding characters

R.W. Stonecypher
6. Multiple-trait breeding

M. Hagman
7. Research programmer

A.E. Squillace
8. Development and action programmes for forest tree improvement

J. Jasso M.
9. Impact of silviculture on forest gene resources

J.M. Fielding
10. Mass production of improved material