HELP: currant or gooseberry fruit worm

[Rachel Salares]

Am looking for a safer way to control fruitworms in gooseberry bushes. The 
plants are mature but we get very limited fruit because of the fruit worm.
Can anyone suggest and effective but safe way of controlling these worms? 
I did try Bt once - it didn't help.  Any suggestions would be quite 
welcome - please send replies to  salares at compmore.net

Thanks!

Rachel