German cockroaches

Adult German cockroach was seen and killed on Dec 16 but my son had seen small dark bugs in the kitchen about a week ago. The place was sprayed yesterday on Dec 21st. They notified us that no further treatments were required. Will one treatment get rid of all of them? Where can I buy bait etc. to ensure none survived? I’ve looked and looked and I can’t find anything in Canada.

German cockroaches are notoriously difficult to bring under complete control. I suggest using ‘Roach Motels’ as monitoring devices, and if cockroaches show up in them, schedule another treatment. In the meantime, the insect growth regulator (IGR) Pyriproxyfen should be available in Canada – see It usually is marketed under the brand name NyGuard.