Well, so much for the spinosad use. It is a product not sold in Canada based on the research I have done online. Some people have ordered it in from US resources but in US $ and significant costs for shipping if you can get it past customs. I am not willing to go that route so back to squish and behead!! I know of a source for nemtodes so I think I will try that first next spring. The only issue is my irises are spread out over several perennial beds so I doubt I could treat them all. Thanks to all for the info on the iris borer.
