According to "The Encyclopedia of Organic Gardening", the following organic control is recommended:
A handful of wood ashes and an equal amount of hydrated lime can be mixed in two gallons of water to brew an effective spray. Be sure to cover both top and lower sides of the foliage. Interplanted marigolds will help keep the beetles away.
good luck.
Bill

Hmmmmmmmm.

I'd suggest a spray of commercial insecticidal soap when you see that beetles are active. Neem sprays are also reported to be very effective for beetle control.

Thanks for your replies.

The wood ashes/lime solution would not be possible for me but thanks.

I already have some Safer brand Yard and Garden insect killer and will try that. The ingredients are "combo of insecticidal soap and botanical pyrethrins*

More ideas? if that doesn't help?

The scorpion hand vac with the nozzle. Vacuum them up daily. They can often be found in the flowers and on new leaf clusters. Dump in soapy water to kill. Daily patrols are important to keep the numbers down. Won't harm the beneficials.
Mrs H