Out of these, chemical pesticides have proved their edge over all others. However, near commercial and home regions, it is advisable to use biological methods and not chemicals as they can easily affect health adversely. One of the biggest disadvantages of this methodology is  that the results are quite temporary and you will need to make repeated rounds for better results. Excessive use can easily ruin your crops, plants, soil quality, your breathe, and so forth. Also, if you use these incorrectly it can be poisonous for your pets and small kids even if the adults take care of all precautions. So, the best way is to go with the conventional procedures according to location. Also when you are choosing between chemicals make sure you do your homework to seclude the most suitable one. 

Or the best option is to go with the pest control service providers to do the job. There are ample number of pest control service providers including the specialized ones like ant control services providers from Langley or Rat Control Langley and so forth. You can always browse net to get the most suitable ones around you and then give them a call or talk to them about an appointment.