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Chemicals not working.

Hi, I called pest control in January and the guy came and spread some chemical and gave me 6 months warranty but nothing happened and the insect problem still same so I called him again and we did that for 4 times and still the same, please advice. Khalid.  Burlington – Ontario

We would need more information in order to offer any help.  What species of insect do you have?  Where are you seeing it?  What chemical was applied?  How? Where?   What other steps were taken to eliminate the problem?  Pesticides have little or no long term effect on some pests. (ex: sow bugs)