My elderly friend has a cockroaches problem. Does lemon oil in water attract the roaches and kills them. I told her to dice an onion and sprinkle with soda to see if it kills roaches. Fredericton
I have seen no proven evidence that any essential oils (including lemon) are effective as cockroach control. Neither are onions. I suggest, visit the cockroach control section of the pestcontrolcanada.com web pages Cockroach Control Recommendations .
The basics can summed up as:
1. Clean your home well and often to get rid of the roaches’ food sources.
2. Seal cracks and crevices where cockroaches can enter your home.
3. Eliminate sources of excess moisture such as leaky pipes and taps.