Disease in the absence of infectious pathogens. Genetic abnormalities. Adverse environment. Nutrient imbalance. Disease in the presence of infectious pathogens.

Part 1. infectious diseases;bacterial diseases;fungal diseases;plant bed diseases;foliar diseases;field and storage diseases;storage rots;floral, seed, and seed

In the last four decades of the twentieth century the use of sweetpotato was diversified beyond their classification as subsistence, food security, and famine-r