CONTENTS 



PREFACE Ill 



ACKNOWLEDGEMENTS IV 



PANEL I. BASIC BIOLOGY OF RUSTS AND RUST DISEASE RESISTANCE 



Clayton 0. Person MODERATOR 1 



Peter E. Day 



THE GENETICS OF RUST FUNGI 3 



John W. Duf field 



LIMITATIONS AND ADVANTAGES OF CONIFERS VS. AGRONOMIC 



CROPS AS RESISTANCE BREEDING MATERIALS 19 



William Q. Loegering 



SPECIFICITY IN PLANT DISEASE 29 



J. C. Zadoks 



REFLECTIONS ON DISEASE RESISTANCE IN ANNUAL CROPS 43 



Eva Fuchs 



QUESTIONS OF RACE DIFFERENTIATION WORK IN CEREAL RUSTS ... 65 



Michael Shaw 



PHYSIOLOGY OF RUST RESISTANCE 87 



Clayton 0. Person 



MODERATOR'S SUMMARY: BASIC BIOLOGY OF RUSTS AND RUST 



DISEASE RESISTANCE 93 



PANEL II. ASSAY OF THE WORLD «S WHITE PINE BREEDING MATERIALS 



Richard T. Bingham MODERATOR 97 



SECTION A. INTRINSIC QUALITIES, GROWTH- POTENTIAL, AND 



ADAPTATION OF NATIVE AND INTRODUCED WHITE PINES 99 



Kurt Holzer 



INTRINSIC QUALITIES AND GROWTH POTENTIAL OF PINUS CEMBRA 



AND PINUS PEUCE IN EUROPE 99 



Richard Schmitt 



INTRINSIC QUALITIES, ACCLIMATIZATION, AND GROWTH-POTENTIAL 



OF WHITE PINES INTRODUCED INTO EUROPE, WITH EMPHASIS ON 



PINUS STROBUS Ill 



VII 



