American Phytopathological Society Board & Staff. VIEW ABSTRACT | VIEW ARTICLE
Obituary
Cecil Edmund Yarwood, 1907-1981. A. H. Gold, A. R. Weinhold, and L. M. Black. Page 509. VIEW ABSTRACT | VIEW ARTICLE
Letter to the Editor
Estimating Relative Fitness in Plant Parasites: Some General Problems. John A. Barrett. Pages 510-512. VIEW ABSTRACT | VIEW ARTICLE
Letter to the Editor
Race Dynamics of Puccinia graminis f. sp. tritici in the USA from 1973 to 1980. S. Nagarajan. Pages 512-514. VIEW ABSTRACT | VIEW ARTICLE
Letter to the Editor
Some Additional Comments on Sorting Infection-Type Data Sets. D. R. Knott, R. Johnson. Pages 514-515. VIEW ABSTRACT | VIEW ARTICLE
Etiology
Comparison of a New Soilborne Virus from Cucumber with Tombus-, Diantho-, and Other Similar Viruses. R. Koenig, D.-E. Lesemann, W. Huth, and K. M. Makkouk. Pages 515-520. VIEW ABSTRACT | VIEW ARTICLE
Disease Detection and Losses
Quantification of Foliar Plant Disease Symptoms by Microcomputer-Digitized Video Image Analysis. S. E. Lindow, R. R. Webb. Pages 520-524. VIEW ABSTRACT | VIEW ARTICLE
Ecology and Epidemiology
Escape of Peronospora tabacina Spores from a Field of Diseased Tobacco Plants. Donald E. Aylor, Gordon S. Taylor. Pages 525-529. VIEW ABSTRACT | VIEW ARTICLE
Vector Relations
Colonization of the Sharpshooter Vectors, Oncometopia nigricans and Homalodisca coagulata, by Xylem-Limited Bacteria. R. H. Brlansky, L. W. Timmer, W. J. French, and R. E. McCoy. Pages 530-535. VIEW ABSTRACT | VIEW ARTICLE
Physiology and Biochemistry
Oxygen Status of Potato Tuber Tissue in Relation to Maceration by Pectic Enzymes of Erwinia carotovora. E. A. Maher, A. Kelman. Pages 536-539. VIEW ABSTRACT | VIEW ARTICLE
Disease Control and Pest Management
Effects of Fall Infection by Gaeumannomyces graminis var. tritici and Triadimenol Seed Treatment on Severity of Take-All in Winter Wheat. W. W. Bockus. Pages 540-543. VIEW ABSTRACT | VIEW ARTICLE
Ecology and Epidemiology
Effects of Certain Solutes, Osmotic Potential, and Soil Solutions on Parasitism of Criconemella xenoplax by Hirsutella rhossiliensis. B. A. Jaffee, E. I. Zehr. Pages 544-546. VIEW ABSTRACT | VIEW ARTICLE
Disease Control and Pest Management
Calculation of Selection Coefficients Against Unnecessary Genes for Virulence from Field Data. M. W. Grant, S. A. Archer. Pages 547-551. VIEW ABSTRACT | VIEW ARTICLE
Disease Detection and Crop Losses
Injury and Yield Responses of Peanuts to Chronic Doses of Ozone in Open-Top Field Chambers. Allen S. Heagle, Michael B. Letchworth, and Colleen A. Mitchell. Pages 551-555. VIEW ABSTRACT | VIEW ARTICLE
Resistance
Sporulation of Cercospora arachidicola as a Criterion for Screening Peanut Genotypes for Leaf Spot Resistance. S. M. Gobina, H. A. Melouk, and D. J. Banks. Pages 556-558. VIEW ABSTRACT | VIEW ARTICLE
Ecology and Epidemiology
Role of Primary and Secondary Zoospores of Plasmodiophora brassicae in the Development of Clubroot in Chinese Cabbage. Robin L. Dobson, R. L. Gabrielson. Pages 559-561. VIEW ABSTRACT | VIEW ARTICLE
Cytology and Histology
Histopathology of Root Disease Incited by Thielaviopsis basicola in Ilex crenata. Robert L. Wick, Laurence D. Moore. Pages 561-564. VIEW ABSTRACT | VIEW ARTICLE
Genetics
Ascospore Dimorphism in Sclerotinia trifoliorum and Cultural Characters of Strains from Different-Sized Spores. J. Y. Uhm, H. Fujii. Pages 565-569. VIEW ABSTRACT | VIEW ARTICLE
Genetics
Heterothallism and Mating Type Mutation in Sclerotinia trifoliorum. J. Y. Uhm, H. Fujii. Pages 569-572. VIEW ABSTRACT | VIEW ARTICLE
Techniques
Separation of Strains of Pseudomonas syringae pv. tomato into Serovars by Three Serological Methods. J. B. Jones, D. L. Dawe, and S. M. McCarter. Pages 573-576. VIEW ABSTRACT | VIEW ARTICLE
Ecology and Epidemiology
Association of Pseudomonas syringae pv. lachrymans and Other Bacterial Pathogens with Roots. Curt Leben. Pages 577-581. VIEW ABSTRACT | VIEW ARTICLE | VIEW ERRATUM
Vector Relations
Transmission of Spiroplasma citri by Circulifer tenellus. Hsing- Yeh Liu, D. J. Gumpf, G. N. Oldfield, and E. C. Calavan. Pages 582-585. VIEW ABSTRACT | VIEW ARTICLE
Vector Relations
The Relationship of Spiroplasma citri and Circulifer tenellus. Hsing- Yeh Liu, D. J. Gumpf, G. N. Oldfield, and E. C. Calavan. Pages 585-590. VIEW ABSTRACT | VIEW ARTICLE
Cytology and Histology
Histopathology of Susceptible and Resistant Soybean Roots Inoculated with Zoospores of Phytophthora megasperma f. sp. glycinea. Jean E. Beagle-Ristaino, Jane F. Rissler. Pages 590-595. VIEW ABSTRACT | VIEW ARTICLE
Etiology
Pathogenicity of Leptographium and Verticicladiella spp. Isolated from Roots of Western North American Conifers. T. C. Harrington, F. W. Cobb, Jr.. Pages 596-599. VIEW ABSTRACT | VIEW ARTICLE
Genetics
Genetics of Resistance to Benomyl in Venturia inaequalis Isolates from Israel and New York. Talma Katan, E. Shabi, and J. D. Gilpatrick. Pages 600-603. VIEW ABSTRACT | VIEW ARTICLE
Genetics
Spontaneous Occurrence of the Sekiguchi Lesion in Two American Rice Lines: Its Induction, Inheritance, and Utilization. M. A. Marchetti, C. N. Bollich, and F. A. Uecker. Pages 603-606. VIEW ABSTRACT | VIEW ARTICLE
Disease Detection and Losses
Yield Loss of Maize Caused by Kabatiella zeae. Francisco J. B. Reifschneider, Deane C. Arny. Pages 607-609. VIEW ABSTRACT | VIEW ARTICLE
Disease Control and Pest Management
Effect of Mulching on Web Blight of Beans in Costa Rica. J. J. Galindo, G. S. Abawi, H. D. Thurston, and G. Gálvez. Pages 610-615. VIEW ABSTRACT | VIEW ARTICLE
Cytology and Histology
Ultrastructural Cytology of Soybean Infected with Mild and Severe Strains of Soybean Mosaic Virus. P. L. Hunst, S. A. Tolin. Pages 615-619. VIEW ABSTRACT | VIEW ARTICLE
Resistance
Wound-Induced Lignin Formation and Resistance to Cellulase in Oat Leaves. Gordon T. Geballe, Arthur W. Galston. Pages 619-623. VIEW ABSTRACT | VIEW ARTICLE
Techniques
Development of a Solid-Phase Radioimmunoassay for Detection of Soybean Mosaic Virus. G. R. Bryant, D. P. Durand, and J. H. Hill. Pages 623-629. VIEW ABSTRACT | VIEW ARTICLE
Physiology and Biochemistry
Influence of O2 and CO2 on Wood Decay by Heartrot and Saprot Fungi. T. L. Highley, S. S. Bar-Lev, T. K. Kirk, and M. J. Larsen. Pages 630-633. VIEW ABSTRACT | VIEW ARTICLE
