Hemnancy, I have the same problem with both red and black currant bushes. After doing some research on the currant fruit fly, I decided to try to interupt the life cycle by covering some of them in bags made of row cover material. I laid down plastic sheeting between the stems of the currant to keep any flies from gaining access from underneath the bags. The bags were applied just after the flowers appeared and I left them on until it was time to pick. No maggots in the berries but way too many aphids! So, I still need to determine how long the currant fly hangs around after hatching and then remove the bags once they are gone so the ladybettles and other natural aphid controls can get to work. If anyone has specific information on how long the currant fly is around after laying its eggs, could you please let me know?