Hi Frank, yes I was very excited to read your previous post about your success with your results with the wasp! I often visit the Olds agricultural college nearby. A worker mentioned to me last year they were testing out the wasps, I think they are called 'Tetrastichus Setifer'. I didn't think about asking them to have some wasps until I read about your experience; that's a really good idea.
My understanding is they have been testing the wasp in Calgary, Carlton University in Ottawa, and at Olds College as of 2016. I hope they can confirm the wasps are able to overwinter & establish here in Alberta, or if they are able to release it on a larger scale here.
One of my neighbours pulled out all of her lilies because of the beetles. Daily patrols have worked for me, I put a container of soapy water under the adults and they fall into once I knock the leaf. With my plan to add more lilies, I'm still exploring other non-insecticide methods so I don't have to check every day. I've heard others have some luck with Neem oil, talc powder, and garlic spray. I wonder if these are all related as they mask the odour/scent of the lilies? I'm still learning....
William, interesting observations, I can say the same about my yard - I used to have lilies in the north bed, where the wind arrives first. Those lilies in the front were always affected by beetles first. With this in mind, I may plant in areas which are more hidden from wind.
I like what you mention about a "capture crop." The beetles started on my orientals in my south bed last year, perhaps this was because I removed all the asiatics from the north bed. I wonder if keeping some lilies in the north bed where the wind comes first will distract the beetles from the others in the south bed...
