Due to the increasing number of curly top virus outbreaks in California, many groups joined in the development of curly top resistant cultivars. California was successful in developing curly top resistant cultivars that were suitable to growing conditions in California. This method was soon abandoned in the mid-1900s due to low yields. The high yielding susceptible crops were quickly adopted across parts of California that were not affected with the BCTV. Crop production was successful for several years until the virus resurfaced in 2001 and 2003, causing major losses.