American Phytopathological Society Board & Staff. VIEW ABSTRACT | VIEW ARTICLE
Cecil Edmund Yarwood, 1907-1981. A. H. Gold, A. R. Weinhold, and L. M. Black. Page 509. VIEW ABSTRACT | VIEW ARTICLE
Estimating Relative Fitness in Plant Parasites: Some General Problems. John A. Barrett. Pages 510-512. VIEW ABSTRACT | VIEW ARTICLE
Race Dynamics of Puccinia graminis f. sp. tritici in the USA from 1973 to 1980. S. Nagarajan. Pages 512-514. VIEW ABSTRACT | VIEW ARTICLE
Some Additional Comments on Sorting Infection-Type Data Sets. D. R. Knott, R. Johnson. Pages 514-515. VIEW ABSTRACT | VIEW ARTICLE
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
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
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
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
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
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
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
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
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
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
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
Histopathology of Root Disease Incited by Thielaviopsis basicola in Ilex crenata. Robert L. Wick, Laurence D. Moore. Pages 561-564. VIEW ABSTRACT | VIEW ARTICLE
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
Heterothallism and Mating Type Mutation in Sclerotinia trifoliorum. J. Y. Uhm, H. Fujii. Pages 569-572. VIEW ABSTRACT | VIEW ARTICLE
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
Association of Pseudomonas syringae pv. lachrymans and Other Bacterial Pathogens with Roots. Curt Leben. Pages 577-581. VIEW ABSTRACT | VIEW ARTICLE | VIEW ERRATUM
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
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
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
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 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
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
Yield Loss of Maize Caused by Kabatiella zeae. Francisco J. B. Reifschneider, Deane C. Arny. Pages 607-609. VIEW ABSTRACT | VIEW ARTICLE
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
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
Wound-Induced Lignin Formation and Resistance to Cellulase in Oat Leaves. Gordon T. Geballe, Arthur W. Galston. Pages 619-623. VIEW ABSTRACT | VIEW ARTICLE
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
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