Pears. Dragon fruit is a low-sugar fruit, containing 9-14% sugar; while the sugar content of pears is relatively high, ripe pears contain 12-18% sugar, which shows that the sugar content of pears is higher than dragon fruit. Ruler, for the cactus family Ruler genus plants, also known as the king flower, three-pronged arrow, triangular column, the king whip, etc., the commercial name of the dragon fruit, for the perennial climbing fleshy shrubs, Ruler is distributed in Central America to the northern part of South America, the world is widely cultivated, China's Guangxi, Guangdong, Fujian, Yunnan, Guizhou and other southern provinces have been introduced into the planting.