1. Frequency and mechanisms of 2n egg formation in haploid tuberosum-wild species F₁ hybrids

   • Joanna E. Werner
   • S. J. Peloquin

   OriginalPaper Pages: 641 - 654

2. Genetic transmission of potato leafhopper resistance from recurrent selection populations in potatoSolanum tuberosum L. Gp. tuberosum

   • L. L. Sanford
   • T. L. Ladd

   OriginalPaper Pages: 655 - 662

3. Errata

   • A. A. Alsadon
   • K. W. Knutson

   Erratum Pages: 664 - 664

4. Biology and ecology ofCorynebacterium sepedonicum

   • Steven A. Slack

   OriginalPaper Pages: 665 - 670

5. Factors affecting infection, disease development, and symptom expression of bacterial ring rot

   • F. E. Manzer
   • N. C. Gudmestad
   • G. A. Nelson

   OriginalPaper Pages: 671 - 676

6. Certification policies and practices in reference to bacterial ring rot

   • Oscar Gutbrod

   OriginalPaper Pages: 677 - 681

7. The relationship between bacterial ring rot and North American seed potato export markets

   • S. H. De Boer

   OriginalPaper Pages: 683 - 694

8. Recommendations of the National Task Force for the eradication of bacterial ring rot

   • Neil C. Gudmestad

   OriginalPaper Pages: 695 - 697

9. Abstracts of additional papers presented

   • Steven A. Slack
   • Andrew L. Bishop
   • N. C. Gudmestad

   Abstract Pages: 699 - 702

10. Final call for papers for the 72nd Annual Meeting of PAA

    Association Business Pages: 703 - 704

11. Final call for Graduate Student Papers for the 72nd Annual Meeting of PAA

    Association Business Pages: 704 - 705

12. Final call for nominations for Honorary Life Membership in PAA

    Association Business Pages: 705 - 706

13. Felix Zeloski 1898–1987

    News and Reviews Pages: 707 - 708

14. Call for papers for the 72nd Annual Meeting of PAA

    Announcement Pages: N1 - N1

15. Call for graduate student papers for the 72nd Annual Meeting of PAA

    Announcement Pages: N2 - N2

16. PAA Abstract Form

    Abstract Pages: N3 - N3