Preface, Contributors, Colorplates. I. General. 1. Introductory remarks. 2. Origin, Distribution and Economic Importance. 3. Botany and Physiology. 4. Important Cultivars, Varieties, and Hybrids. 5. Genetic Engineering. 6. Propagation of Sweetpotatoes, in situ Germplasm Conservation and Conservation by Tissue Culture. 7. Major Fungal and Bacterial Diseases. 8. Virus and Phytoplasma Diseases. 9. Nematodes. 10. Insects. 11. Uses and Nutritional Data of Sweetpotato. 12. Economics of Sweetpotato Production and Marketing. 13. Marketing Sweet Potatoes in the United States. II. Sweet potatoes in different regions. 14. Sweetpotato Production in the United States. 15. Sweetpotato in China. 16. Sweetpotato in sub-Saharan-Africa. 17. Sweetpotato in the Indian subcontinent. 18. Sweetpotato in South and Central America. 19. Sweetpotato in West Africa. 20. Sweetpotato in South East Asia. 21. Sweetpotato in Israel. 22. Sweetpotato in Oceania. 23. Concluding Remarks.