CONTENTS 1
THE FUTURE OF PLANT PATHOLOGY,J.C.Walker 1
GROWTH REGULATORS IN PLANT DISEASE,Luis Sequeira 5
CLIMATE AND FOREST DISEASES,George H.Hepting 31
HETEROKARYOSIS AND VARIABILITY IN PLANT-PATHOGENIC FUNGI,J.R.Parmeter,Jr.,W.C.Snyder,and R.E.Reichle 51
CHEMISTRY AND PHYSIOLOGY OF FUNGICIDAL ACTION,Robert G.Owens 77
SELECTIVE TOXICITY OF CHEMICALS TO SOIL MICROORGANISMS,William A.Kreutzer 101
THE DIRECT ASSAY OF PLANT PATHOGEN POPULATIONS IN SOIL,J.D.Menzies 127
BIOLOGY OF SOIL-BORNE VIRUSES,C.H.Cadman 143
PLANT VIRUS—HOST CELL RELATIONS,K.W.Mundry 173
PHYSIOLOGY OF VIRUS-INFECTED PLANTS,T.O.Diener 197
HOST RESPONSE TO NEMATODE INFECTION,L.R.Krusberg 219
THE ECOLOGY OF SOIL-BORNE FUNGAL DISEASE,David Park 241
THE PHYSIOLOGY AND HOST-PARASITE RELATIONS OF THE RUSTS,Michael Shawv 259
PHYsIOLOGY AND BIOCHEMISTRY OF DISEASE RESISTANCE OF PLANTS,Kohei Tomiyama 295
DEGRADATION OF CELLULOSE,Birgitta Norkrans 325
PHYTOALEXINs,I.A.M.Cruickshank 351
VARIATION IN THE GENUS Phytophthora,D.C.Erwin,G.A.Zentmyer,J.Galindo,and J.S.Niederhauser 375
BAcTERIOPHAGEs OF PLANT PATHOGENS,Norio Okabe and Masao Goto 397
AUTHOR INDEX 419
SUBJECT INDEX 432