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Whether a one-time spray treatment to control mosquitoes is enough depends on multiple factors. Often, you’ll notice a big difference after one application. However, mosquitoes are likely to return if you don't reduce attractive standing water habitats. This usually takes four to eight weeks if it’s still prime mosquito season.

Yes, crawl spaces can attract bugs, especially since moisture tends to build up in the space, and moisture attracts pests. A good way to prevent pest infestation in your crawl space is to install a vapor barrier—called crawl space encapsulation—on the interior to seal the space, along with a French drain or some other kind of foundation drainage system outside to keep runoff out of your crawl space. You can also seal foundation cracks and repair damages to cut off access to pests.

They’re a nuisance, but silverfish aren’t nearly as dangerous as other pests like cockroaches, mice, termites or bed bugs. They don’t carry diseases that humans or pets can catch, and they don’t cause widespread destruction like termites or rats. Silverfish are small and find it very easy to get inside any exposed foodstuffs. Like weevils, you may find them in unprotected flour, cereal, grains, bread boxes, chip packages and more. They will happily nibble fabric and paper as well, so they can cause damage to furniture, clothing, books, bedding, curtains and other materials.

It takes a few weeks to get rid of roaches in the kitchen for a small infestation, as the cockroaches will need to take the bait back to their nest to infect the others. For larger infestation, you may need to schedule multiple professional treatments, which could take several weeks or up to 6 months to get rid of the roaches fully.