Is it wrong to hire others to spray hazardous chemicals?

I live in a country where I doubt the regulations pertaining to any household pesticides are more than a rubber stamp. At present, my kitchen is full of cockroaches, and labor is cheap. Would it be immoral for me to hire the old housekeeper who does tasks for me to spray the pesticide that I bought at our supermarket for me? I wouldn't be willing to do the spraying myself, due to the potential hazards.