m.....

cock-roach ?
From Google , found a way ....
Solve a cock roach problem : Get rid of roaches . Combine equal parts boric acid and sugar , mix well .
Sprinkle in crevices and , if building or remodeling , between walls before putting up plaster board .
Put the powerd in jar lids or saucers and place behind the fridge and under sinks .
Caution : Keep mixture away from children and pets
If ingested in large quantities , or even in small amounts over several days , boric acid can be harmful !!