Around the 80s, when China's economic conditions were limited, candy was a luxury, and children took the roundworm "pagoda sugar" as sugar to eat, and the taste was very sweet, so it was widely praised. 
However, this pagoda candy has slowly disappeared, and the time of disappearance should be estimated to be in 1985, so why did the pagoda sugar become extinct?Is it really eliminated because of the needs of the times, although there are certain factors, but they are not the main factors. The main raw material of pagoda sugar is Artemisia annua, Artemisia annua is a perennial herb, the flowering and fruiting period is from August to October, according to the record of "Chinese Materia Medica", the flower buds are harvested from August to September when they are about to bloom, and the appearance changes from green to yellow-green, with strong cold resistance, mainly used in winter sowing and spring sowing. 
Pagoda sugar is mainly used to deal with the ancient parasites in humans, ascariasis is a very common disease, in order to deal with this disease began to develop roundworm drugs, but there is no artemisia in our country, which is a unique medicinal plant that grows in the Arctic Circle. Before the 60s, China established diplomatic relations with the Soviet Union, and medicine was also one of the aid projects, and in order to be able to produce Artemisia annua by itself, China introduced Artemisia annua seeds, and the Soviet Union only gave us 20 grams of seeds at that time. 
It can be seen the preciousness of Artemisia annua, the 20 grams of seeds were divided into 4 points, respectively, sent to Hohhot, Datong, Xi'an, Weifang four farms were trial, in these three production bases, only Weifang's Artemisia was successful, at that time, in order to keep secret, Artemisia annua was declared to be "No. 1 pyrethrum". With the vigorous promotion of the cultivation of Artemisia annua, pagoda sugar also began to develop, and the whole people began to take pagoda sugar, but after the 60s, the relationship between China and the Soviet Union was rigid, and the Soviet Union unilaterally tore up the aid agreement and withdrew all the experimental machines. 
Although the Soviet Union withdrew the machine, our country also developed its own extractor, but this large machine extracted very few raw materials, some big pharmaceutical factories are willing to buy Artemisia annua, a large piece of Artemisia annua rotted in the ground, in 1964, Weifang Farm encountered 40 consecutive days of rainy weather. Patches of Artemisia annua were cut off due to waterlogging, and one of the three bottles of seeds stored in the ground was broken, although after this large-scale promotion, due to the production of large-scale Artemisia annua for a time, the inventory was overstocked, and the planting production was terminated. 
In 1982, the Ministry of Health developed a better anthelmintic drug, pagoda sugar began to be phased out, in 1985, Artemisia annua was extinct from the country, although the disappearance of Artemisia annua is a pity, but on the other hand, it also shows that China's medical cause is getting better and better.