In the 1950s, seeds of the American Sugar Baby watermelon cultivar were sold to Taiwan, and the farmers then sold the harvested watermelons to Hong Kong. Because Sugar Baby seeds are not disease resistant, the seedlings are prone to fusarium wilt if allowed to continue to the second generation: the watermelon vines will split open and crops will wither, causing great losses to unwary farmers.
1950 年代，美國「蜜寶」西瓜種子銷來台灣，農民再將收成後的西瓜外銷到香港；由於「蜜寶」種子不具抗病性，若繼續繁殖第二代，種苗就會罹患「西瓜蔓割病」，西瓜藤會裂開，作物萎凋，對不知情的農民造成極大損失。