Yep, I am in Montreal and those markings are that of the stink bug for sure. I have used trounce 2, horticultural oil with insecticidal soap. One thing that helps if you catch it early is to examine the undersides of the leaves. They lay their eggs in a symmetirical pattern. That's how I first found them otherwise I'd be overrun. You need to spray on and underneath the leaves. The old fashioned but equally effective way is to try hand picking them off or at least knocking them into a bucket with the solution. They can move quickly. Also keep your area as free from weeds or other growth where they can hide and lay their egges.
Good luck! Sharon
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