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Roach spray usually starts working almost immediately on contact—within seconds to a few minutes. However, if it's a residual spray designed to keep killing over time, it can take hours or even days to fully affect roaches that come into contact with treated surfaces. For larger infestations, it may take at least a week to see a noticeable drop in activity, since not all roaches are exposed at once.

No. Carpenter ants range far when seeking out food, usually proteins or sugars. They may be attracted to dead pests near your house, or crumbs in the kitchen or pantry. That doesn’t necessarily mean you have an infestation, or that there is a nest nearby. However, it does mean that the ants have found a way to enter your home, so it’s time to be vigilant.

The truth is you may not be able to get rid of a wasp nest without getting stung unless you hire an insect control specialist. As far as getting rid of wasps with home remedies, a far-reaching commercial spray or an insecticidal dust are your best options with the lowest risk of getting stung. Wearing protective gear can also help minimize stings.

Gophers are ubiquitous in certain areas, and the only way to completely get rid of them is to put down gopher wire two feet below the surface of your soil and vertically along the edges of your yard. Unfortunately, this may not be a practical solution unless you’re completely redoing your yard or installing an aboveground garden. Alternatively, you may consider putting underground rock barriers around the edge of your yard to discourage gopher visits. However, you’ll still likely get some pests because they can dig as deep as 6 feet below the surface.