The Economically Important Diseases of Asparagus in the U.S.

Fig. 4. U.S. acreage planted to asparagus from 1930-2000. Intervals represent: (1) period of increased acreage due to advances in canning and transportation; (2) period of decline due to Fusarium crown and root rot; (3) period of increased acreage due to new cultivars and increased demand; and (4) period of decline presumably due to competition from imports.



Image from Plant Health Progress article:
The Economically Important Diseases of Asparagus in the U.S.