Homegrown 'bacteria-free' sweet potatoes for higher … stocking 0 31 2022.05.09 11:34 https://youtu.be/EgUEOoIX_qI + 6 고구마 병해 걱정 끝... '무병묘' 보급 확대 South Korean scientists have developed new varieties of homegrown sweet potatoes that ...