The ban was established because gooseberries and currants can serve as alternate hosts to white pine blister rust (Cronartium ribicola), a fungus that needs both Ribes and white pine to complete its life cycle. This federal legislation was rescinded in 1966. In 1933, Pennsylvania passed a law that limited growing gooseberries and currants in certain areas; however, the law is not enforced. Therefore, all Ribes can be grown in the state. If you have white pine nearby, though, you may want to consider growing less-susceptible types of Ribes. Black currant (Ribes nigrum) is by far the most susceptible, and for this reason many areas outside of Pennsylvania still prohibit growing it. Resistant black currant varieties are available. Red and white currants are less susceptible, and gooseberry is the least susceptible.